Corey Kluber David Richard-USA TODAY Sports

The Red Sox have shut down Corey Kluber from baseball activity, the team informed reporters (including Julian McWilliams of the Boston Globe). The right-hander suffered a setback while rehabbing from shoulder inflammation that sent him to the injured list five weeks ago.

It’s unclear if Kluber’s season is finished. He at least seems likely to be moved to the 60-day injured list once the Sox need a 40-man roster spot, as it’s hard to envision him being ready for MLB action before the third week of August — when he’d be eligible to return from a 60-day placement.

The 2023 season has been a frustration for the two-time Cy Young winner. Kluber struggled over nine starts, posting a 6.26 ERA in 41 2/3 innings. The Sox bumped him out of the rotation. Unlike Nick Pivetta — who has thrived in somewhat shorter stints — Kluber has continued to scuffle in relief. He’s allowed 14 runs in 13 1/3 innings out of the bullpen, largely on account of six homers surrendered.

Kluber’s contract has an $11M club option for next season. Whether he’s able to make it back to the mound or not, that’ll get bought out. He’ll return to free agency during the upcoming offseason.

More must-reads:

TODAY'S BEST
Mavericks come from behind to down Thunder, take 2-1 series lead
Stars continue road dominance with Game 3 win over Avalanche
Watch: Paul Skenes wastes no time showing why Pirates drafted him No. 1 overall
Watch: Braves were one out away from first no-hitter in 30 years
Roman Wilson hopes to become Steelers' next 'great' WR
Chargers sign veteran edge-rusher
Justin Allgaier dominates at Darlington for first win of 2024
'Great mind': One-time NBA champion endorses candidate for Lakers HC job
Celtics respond with impressive road win vs. Cavaliers in Game 3
Hurricanes' power play finally comes through with season on the line
Watch: An outstanding first half by Donovan Mitchell keeps the Cavaliers alive in Game 3 vs. Celtics
Tigers lose veteran starting pitcher to injury
Watch: Minor league baseball game interrupted by turtle delay
Paul Skenes experiences the Pirates' incompetence in just one game
Rangers ace continues to be plagued by nerve irritation in thumb
Cowboys hint at timeline for extension talks with offensive star
Steelers first-round pick has already 'apologized' to new locker mate
Former Packers WR makes bold prediction about Jordan Love
Broncos release former Super Bowl champion WR
Nationals had 'substantive discussions' with former top prospect about extension