Kenley Jansen
RP · S/R · age 39 · DETXIX-AOCTOBER OK
ACTIVE
15+073
16+073 / 16+073
2
5 of 5
2027 CLUB OPTION
Free Agent (LAA) Dec'25
0 / 0
1 yr, $11M (2026), 2027 club option
Next 90 days, by the model
98%
1%
<1%
1%
<1%
Pushing the cut risk around: age (38.96) raises it, this season's strikeout rate (0.28) lowers it, this season's WAR (0.14) raises it.
Context the model does not weigh: ZiPS projects 0.1 WAR, 0.1 WAR this season; 14 RP on the 40-man, of whom Tyler Kinley, Burch Smith are headed to free agency.
Trained on every 40-man roster snapshot since 2011 and what happened in the following 90 days; it sees roster status, options, service, history and last season's line, not this season's performance or the club's intentions. How well it does.
Is there a job for him next year?
DET returns 11 RP on the 40-man once 2 free agents leave; about 9 RP jobs survive a normal winter. By his own recent record he ranks 4th among the returners (1.0 WAR against a bar of -0.2), which the calibrated model turns into 97% kept through the tender deadline. Ranked by ZiPS and Steamer instead, which credit his longer track record, he is 7th (0.2 WAR, bar 0.1), worth 95% kept on the same model.
| By recent record: returning RP | Proj. WAR |
|---|---|
| 1. Will Vest | 2.0 |
| 2. Drew Sommers | 1.2 |
| 3. Brant Hurter | 1.1 |
| 4. Kenley Jansen | 1.0 |
| 5. Tyler Holton | 0.6 |
| 6. Brenan Hanifee | 0.3 |
| 7. Kyle Finnegan | 0.2 |
| 8. Beau Brieske | -0.2 |
| 9. Yilber Diazlast job | -0.2 |
| 10. Bailey Horn | -0.5 |
| 11. Jacob Waguespack | -0.5 |
| By ZiPS / Steamer: returning RP | Proj. WAR |
|---|---|
| 1. Will Vest | 0.8 |
| 2. Brant Hurter | 0.8 |
| 3. Tyler Holton | 0.6 |
| 4. Brenan Hanifee | 0.3 |
| 5. Kyle Finnegan | 0.3 |
| 6. Jacob Waguespack | 0.3 |
| 7. Kenley Jansen | 0.2 |
| 8. Beau Brieske | 0.2 |
| 9. Drew Sommerslast job | 0.1 |
| 10. Yilber Diaz | 0.1 |
| 11. Bailey Horn | -0.1 |
Departing free agents are excluded; players on club, mutual or player options are counted as returning. The kept probability is calibrated on every September since 2012 using the recent-record projection; the ZiPS/Steamer reading uses the same model with a different ranking, so treat it as a second opinion rather than a calibrated number. Salary enters once arbitration projections publish in October.
October: Post-season eligible
On the 40-man before noon ET Sep 1. He stays eligible as long as he remains on the 40-man or 60-day IL through the post-season; an outright after the cutoff would end automatic eligibility.
The post-season eligibility list is fixed at noon ET on September 1: everyone on the 40-man, the 60-day IL or the military list at that moment, who then stays there without interruption. Attachment 25 (Major League Rule 40)
What happens if the club…
- option him to the minorsBLOCKED
- Not without his consent: with five years of service he can refuse the assignment or elect free agency instead. The club's only unilateral moves are to keep him, trade him, or release him.
- Article XIX-A: five years, no forced assignment
- designate him for assignment (or put him on outright waivers)
- The club has 7 days to trade him, pass him through outright waivers, or release him; he is paid at the major-league rate and keeps accruing service in the meantime. On outright waivers any club can claim him for $50,000, worst record first, and the claiming club takes his contract (1 yr, $11M (2026), 2027 club option). If he clears, he cannot be outrighted without his consent: he can refuse and force a release with his contract intact, or elect free agency (forfeiting termination pay). Post-season: an outright after the September 1 cutoff ends his automatic eligibility. He could only return as an approved injury replacement, and only if he accepts the outright and stays on a minor-league reserve list in the organization without interruption; a release makes him ineligible for anyone this October. With real money left on the contract a claim is unlikely; the usual outcome is clearing waivers, then release, with the club paying the balance less what a new club pays him.
- Designated for assignment: 7 days · Outright waivers · Article XIX-A: five years, no forced outright
- release him
- Release waivers cost a claiming club $1 but the claimant assumes the whole contract, so expensive players clear. The club owes the full unpaid balance of this season's salary, offset by whatever another club pays him this year. A released player is not post-season eligible for any club this year.
- Release waivers and termination pay · Which rate a split contract pays at release
- trade himBLOCKED
- Not now: players on major-league contracts cannot be traded after the Aug 3 deadline until the day after the World Series.
- Trade deadline · 10-and-5 rights · June 15 no-trade for free-agent signees
- Decide his contract option
- 2027 Club Option: the decision must be made inside the five-day quiet period after the World Series. If declined and he has six years of service, he is a free agent immediately.
- Article XX-B free agency
What the rules say about him
- Article XIX-A: five years, no forced assignment15+073 of MLB service through 2025: can refuse an optional assignment and cannot be outrighted without consent.A player with five or more years of Major League service cannot be assigned anywhere but another Major League club without his written consent. 2022-2026 Basic Agreement, Article XIX(A)(2), p. 94
- Article XIX-A: five years, no forced outright5+ years of service: an outright assignment requires his consent; otherwise the club must keep, trade or release him.A player with five or more years of service can refuse an outright assignment altogether; the club must then keep him, trade him, or release him. 2022-2026 Basic Agreement, Article XIX(A)(2), p. 94
- Article XX-B free agency6+ years of service but under contract through 2027.Six or more years of service with an expiring contract: free agent at 9 AM ET the day after the last World Series game. 2022-2026 Basic Agreement, Article XX(B)(1)-(2), p. 102
- Post-season roster eligibilityOn the 40-man before noon ET Sep 1. He stays eligible as long as he remains on the 40-man or 60-day IL through the post-season; an outright after the cutoff would end automatic eligibility.The post-season eligibility list is fixed at noon ET on September 1: everyone on the 40-man, the 60-day IL or the military list at that moment, who then stays there without interruption. 2022-2026 Basic Agreement, Attachment 25, p. 253 (the number itself is in Major League Rule 40)
- Rule 5 clockOn a 40-man roster (would first be exposed after 2009 otherwise).
Option years, season by season
| Season | Days on option | Option year used | Stints |
|---|---|---|---|
| 2011 | 5 | no (under 20) | May 1, 2011 to May 6, 2011 (5d) |
| 2010 | 110 | yes | Mar 15, 2010 to Jul 23, 2010 (110d, spring training)Jul 23, 2010 to Jul 23, 2010 (0d, implied) |
Transaction log
| Jun 12, 2026 | Status change | Detroit Tigers activated RHP Kenley Jansen from the 15-day injured list. |
| May 28, 2026 | Status change | Detroit Tigers placed RHP Kenley Jansen on the 15-day injured list. Pelvic inflammation. |
| Dec 17, 2025 | Signed as free agent | Detroit Tigers signed free agent RHP Kenley Jansen. |
| Nov 2, 2025 | Declared free agent | RHP Kenley Jansen elected free agency. |
| Feb 15, 2025 | Signed as free agent | Los Angeles Angels signed free agent RHP Kenley Jansen. |
| Oct 31, 2024 | Declared free agent | RHP Kenley Jansen elected free agency. |
| Oct 1, 2024 | Status change | Boston Red Sox activated RHP Kenley Jansen from the 15-day injured list. |
| Sep 23, 2024 | Status change | Boston Red Sox placed RHP Kenley Jansen on the 15-day injured list. Right shoulder inflammation. |
| Sep 23, 2023 | Status change | Boston Red Sox activated RHP Kenley Jansen from the 7-day injured list. |
| Sep 13, 2023 | Status change | Boston Red Sox placed RHP Kenley Jansen on the 7-day injured list. |
| Dec 13, 2022 | Status change | Boston Red Sox activated RHP Kenley Jansen. |
| Dec 13, 2022 | Signed as free agent | Boston Red Sox signed free agent RHP Kenley Jansen. |
| Nov 6, 2022 | Declared free agent | RHP Kenley Jansen elected free agency. |
| Jul 13, 2022 | Status change | Atlanta Braves activated RHP Kenley Jansen from the 15-day injured list. |
| Jun 28, 2022 | Status change | Atlanta Braves placed RHP Kenley Jansen on the 15-day injured list retroactive to June 27, 2022. Irregular heartbeat. |
| Mar 19, 2022 | Status change | Atlanta Braves activated RHP Kenley Jansen. |
| Mar 19, 2022 | Signed as free agent | Atlanta Braves signed free agent RHP Kenley Jansen. |
| Nov 3, 2021 | Declared free agent | RHP Kenley Jansen elected free agency. |
| Sep 14, 2021 | Status change | Los Angeles Dodgers activated RHP Kenley Jansen from the paternity list. |
| Sep 12, 2021 | Status change | Los Angeles Dodgers placed RHP Kenley Jansen on the paternity list. |
| Aug 20, 2018 | Status change | Los Angeles Dodgers activated P Kenley Jansen from the 10 day injured list. |
| Aug 20, 2018 | Status change | Los Angeles Dodgers activated RHP Kenley Jansen. |
| Aug 10, 2018 | Status change | Los Angeles Dodgers placed RHP Kenley Jansen on the 10-day disabled list. Irregular heartbeat. |
| Jan 10, 2017 | Status change | Los Angeles Dodgers placed RHP Kenley Jansen on the 10-day disabled list. Irregular heartbeat. |
| Jan 10, 2017 | Signed as free agent | Los Angeles Dodgers signed free agent RHP Kenley Jansen. |
| Nov 3, 2016 | Declared free agent | RHP Kenley Jansen elected free agency. |
| May 15, 2015 | Status change | Los Angeles Dodgers activated RHP Kenley Jansen from the 15-day disabled list. |
| Apr 5, 2015 | Status change | Los Angeles Dodgers placed RHP Kenley Jansen on the 15-day disabled list retroactive to March 27, 2015. Fifth metatarsal injury. |
| Aug 25, 2011 | Status change | Los Angeles Dodgers activated RHP Kenley Jansen from the 15-day disabled list. |
| Jul 29, 2011 | Status change | Los Angeles Dodgers placed RHP Kenley Jansen on the 15-day disabled list retroactive to July 27, 2011. Cardiac arrhythmia. |
| Jun 18, 2011 | Status change | Los Angeles Dodgers activated RHP Kenley Jansen from the 15-day disabled list. |
| May 29, 2011 | Status change | Los Angeles Dodgers placed RHP Kenley Jansen on the 15-day disabled list. Right shoulder inflammation. |
| May 6, 2011 | Recalled | Los Angeles Dodgers recalled Kenley Jansen from Chattanooga Lookouts. |
| May 1, 2011 | Optioned | Los Angeles Dodgers optioned Kenley Jansen to Chattanooga Lookouts. |
| Jul 23, 2010 | Recalled | Los Angeles Dodgers recalled Kenley Jansen from Chattanooga Lookouts. |
| Jul 23, 2010 | Contract selected | Los Angeles Dodgers selected the contract of Kenley Jansen from Chattanooga Lookouts. |
| Mar 15, 2010 | Optioned | Los Angeles Dodgers optioned Kenley Jansen to Albuquerque Isotopes. |
Service through 2025 per FanGraphs RosterResource; options and this-season service reconstructed from the MLB transaction log (reconstruction; FanGraphs shows n/a). Rule 5 exposure deadline Nov 17, 2026.