Red Sox closer Kenley Jansen is a free agent after this season and has likely pitched his last game with Boston. Jeff Dean/Associated Press

It seems Kenley Jansen’s season, and his time in Boston, have come to an end.

A day after the veteran closer pitched a scoreless ninth inning Sunday in the Red Sox’s 8-1 win in the first game of a doubleheader with the Minnesota Twins, Jansen was placed on the injured list Monday.

“He’s been dealing with the shoulder and recovering is not (happening) right now for him. He’s been struggling with that,” Cora said following Boston’s 9-3 victory in the second game Sunday. “There’s a good chance he’ll go on the (injured list) tomorrow and we’ll move on.”

Jansen dealt with various ailments and struggled at times this season, but ended up putting up better numbers than last year.

Coming off a 2023 in which he posted a 3.63 ERA and 1.28 WHIP over 51 appearances totaling 44 2/3 innings, he finished 2024 with a 3.29 ERA and 1.06 WHIP over 54 appearances totaling 54 2/3 innings.
In both seasons, he blew four saves.

In Jansen’s absence, Cora said the Red Sox plan to “mix and match” with veteran Chris Martin and rookie Justin Slaten in the closer’s role.

Martin, 38, has been an incredible addition to the bullpen since signing with the club before last season. He’s worked primarily as Jansen’s setup man but also has closed out games, including stepping into the closer role last fall when Jansen’s 2023 season ended due to injuries in mid-September.

This season, Martin owns a 3.48 ERA over 42 appearances, including eight games he finished. Martin finished 12 games last season out of 55 outings.

Slaten, who turned 27 last week, has also made 42 appearances this year, including 15 of four outs or more, and finished seven games. He’s held opponents scoreless in 30 outings, and only allowed multiple runs four times, all before the All-Star break.

He’s allowed more than two earned runs just once.

After two seasons in Boston, Jansen and Martin are headed for free agency this winter. Cora hinted that the Red Sox envision Slaten, who won’t hit free agency for more than half a decade, as a potential long-term closer option.

“I think it’s an opportunity for both of them to get, be the closer,” Cora said.

“Be good for Slaten to kind of, like, get his feet wet in that role.”

DICK MOSS, the lawyer who won the arbitration case that created free agency for baseball players and revolutionized pay for professional athletes, has died. He was 93.

Moss died Saturday at an assisted-living residence in Santa Monica, California, the Major League Baseball Players Association said. He had been in poor health for several years.

Hired by union executive director Marvin Miller as general counsel in 1967, Moss argued the 1975 case involving pitchers Andy Messersmith and Dave McNally that led to arbitrator Peter Seitz striking down the reserve clause. That provision for a unilateral one-year renewal had been included in every contract since 1878 and enabled teams to control players by maintaining those agreements could be extended perpetually.

WHITE SOX: Reliever Ron Marinaccio was claimed off waivers from the New York Yankees and optioned to Double-A Birmingham.

Marinaccio, a 29-year-old right-hander, was 1-0 with a 3.86 ERA in 16 relief appearances during his third season with the Yankees. He went 6-5 with a 3.22 ERA in 101 relief appearances for New York over three seasons.

Marinaccio was 1-3 with a 2.04 ERA and eight saves this year for Triple-A Scranton/Wilkes-Barre.

CUBS: Chicago claimed right-handed reliever Enoli Paredes off waivers from Milwaukee.

Paredes, who turns 29 on Saturday, went 1-0 with a 1.74 ERA and one save in 17 relief appearances with the Brewers. He dealt with a right forearm issue earlier this season that caused him to spend over two months on the injured list.

The Cubs also recalled right-handers Gavin Hollowell and Caleb Kilian from Triple-A Iowa.

ASTROS: Yordan Alvarez was out of the lineup for the start of a three-game series against Seattle because of a bruised right knee.

Alvarez left Sunday’s game against the Angels when he was injured sliding into second base on a double in the third inning.

TIGERS: Detroit added right-hander Jackson Jobe to the roster to bolster its push to make the playoffs for the first time in a decade.

Jobe, 22, who is from Oklahoma City, was drafted No. 3 overall out of high school by the Tigers in 2021 and is regarded as one of the top prospects in baseball.