Kenley Jansen

RP · S/R · age 39 · DET

XIX-AOCTOBER OK

Roster status
ACTIVE
Service thru 2025
15+073
Service now / projected
16+073 / 16+073
Option years left (2026)
2
Assignments left this season
5 of 5
Contract (2027)
2027 CLUB OPTION
Acquired
Free Agent (LAA) Dec'25
Outrighted / DFA'd before
0 / 0
Contract
1 yr, $11M (2026), 2027 club option

Next 90 days, by the model

Stays put
98%
Designated
1%
Optioned
<1%
Traded
1%
Released or non-tendered
<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 RPProj. WAR
1. Will Vest2.0
2. Drew Sommers1.2
3. Brant Hurter1.1
4. Kenley Jansen1.0
5. Tyler Holton0.6
6. Brenan Hanifee0.3
7. Kyle Finnegan0.2
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 RPProj. WAR
1. Will Vest0.8
2. Brant Hurter0.8
3. Tyler Holton0.6
4. Brenan Hanifee0.3
5. Kyle Finnegan0.3
6. Jacob Waguespack0.3
7. Kenley Jansen0.2
8. Beau Brieske0.2
9. Drew Sommerslast job0.1
10. Yilber Diaz0.1
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

Option years, season by season

SeasonDays on optionOption year usedStints
20115no (under 20)May 1, 2011 to May 6, 2011 (5d)
2010110yesMar 15, 2010 to Jul 23, 2010 (110d, spring training)Jul 23, 2010 to Jul 23, 2010 (0d, implied)

Transaction log

Jun 12, 2026Status changeDetroit Tigers activated RHP Kenley Jansen from the 15-day injured list.
May 28, 2026Status changeDetroit Tigers placed RHP Kenley Jansen on the 15-day injured list. Pelvic inflammation.
Dec 17, 2025Signed as free agentDetroit Tigers signed free agent RHP Kenley Jansen.
Nov 2, 2025Declared free agentRHP Kenley Jansen elected free agency.
Feb 15, 2025Signed as free agentLos Angeles Angels signed free agent RHP Kenley Jansen.
Oct 31, 2024Declared free agentRHP Kenley Jansen elected free agency.
Oct 1, 2024Status changeBoston Red Sox activated RHP Kenley Jansen from the 15-day injured list.
Sep 23, 2024Status changeBoston Red Sox placed RHP Kenley Jansen on the 15-day injured list. Right shoulder inflammation.
Sep 23, 2023Status changeBoston Red Sox activated RHP Kenley Jansen from the 7-day injured list.
Sep 13, 2023Status changeBoston Red Sox placed RHP Kenley Jansen on the 7-day injured list.
Dec 13, 2022Status changeBoston Red Sox activated RHP Kenley Jansen.
Dec 13, 2022Signed as free agentBoston Red Sox signed free agent RHP Kenley Jansen.
Nov 6, 2022Declared free agentRHP Kenley Jansen elected free agency.
Jul 13, 2022Status changeAtlanta Braves activated RHP Kenley Jansen from the 15-day injured list.
Jun 28, 2022Status changeAtlanta Braves placed RHP Kenley Jansen on the 15-day injured list retroactive to June 27, 2022. Irregular heartbeat.
Mar 19, 2022Status changeAtlanta Braves activated RHP Kenley Jansen.
Mar 19, 2022Signed as free agentAtlanta Braves signed free agent RHP Kenley Jansen.
Nov 3, 2021Declared free agentRHP Kenley Jansen elected free agency.
Sep 14, 2021Status changeLos Angeles Dodgers activated RHP Kenley Jansen from the paternity list.
Sep 12, 2021Status changeLos Angeles Dodgers placed RHP Kenley Jansen on the paternity list.
Aug 20, 2018Status changeLos Angeles Dodgers activated P Kenley Jansen from the 10 day injured list.
Aug 20, 2018Status changeLos Angeles Dodgers activated RHP Kenley Jansen.
Aug 10, 2018Status changeLos Angeles Dodgers placed RHP Kenley Jansen on the 10-day disabled list. Irregular heartbeat.
Jan 10, 2017Status changeLos Angeles Dodgers placed RHP Kenley Jansen on the 10-day disabled list. Irregular heartbeat.
Jan 10, 2017Signed as free agentLos Angeles Dodgers signed free agent RHP Kenley Jansen.
Nov 3, 2016Declared free agentRHP Kenley Jansen elected free agency.
May 15, 2015Status changeLos Angeles Dodgers activated RHP Kenley Jansen from the 15-day disabled list.
Apr 5, 2015Status changeLos Angeles Dodgers placed RHP Kenley Jansen on the 15-day disabled list retroactive to March 27, 2015. Fifth metatarsal injury.
Aug 25, 2011Status changeLos Angeles Dodgers activated RHP Kenley Jansen from the 15-day disabled list.
Jul 29, 2011Status changeLos Angeles Dodgers placed RHP Kenley Jansen on the 15-day disabled list retroactive to July 27, 2011. Cardiac arrhythmia.
Jun 18, 2011Status changeLos Angeles Dodgers activated RHP Kenley Jansen from the 15-day disabled list.
May 29, 2011Status changeLos Angeles Dodgers placed RHP Kenley Jansen on the 15-day disabled list. Right shoulder inflammation.
May 6, 2011RecalledLos Angeles Dodgers recalled Kenley Jansen from Chattanooga Lookouts.
May 1, 2011OptionedLos Angeles Dodgers optioned Kenley Jansen to Chattanooga Lookouts.
Jul 23, 2010RecalledLos Angeles Dodgers recalled Kenley Jansen from Chattanooga Lookouts.
Jul 23, 2010Contract selectedLos Angeles Dodgers selected the contract of Kenley Jansen from Chattanooga Lookouts.
Mar 15, 2010OptionedLos 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.