Kluber announced his retirement from professional baseball Friday, Paul Hoynes of The Cleveland Plain Dealer reports.

Kluber (shoulder) didn't commit to pitching in 2024 when asked about his plans Friday, Chris Cotillo of The Springfield Republican reports.

The Red Sox declined Kluber's $11 million option for 2024 on Friday, Jen McCaffrey of The Athletic reports.

Kluber (shoulder) feels healthy but will not pitch again this season, Ian Browne of MLB.com reports.

Kluber (shoulder) allowed two hits and struck out two over 2.2 scoreless innings for Triple-A Worcester on Tuesday.

Kluber (shoulder) had his first rehab appearance pushed from Friday to Saturday, MLB.com reports.

Kluber (shoulder) has been cleared to begin a rehab assignment with Double-A Portland on Friday, MLB.com reports.

Red Sox manager Alex Cora said Saturday that Kluber (shoulder) will throw a bullpen session soon, MLB.com reports.

Boston transferred Kluber (shoulder) from the 15-day injured list to the 60-day injured list Friday, Chris Cotillo of The Springfield Republican reports.

The Red Sox shut down Kluber (shoulder) from all baseball activity Saturday, Julian McWilliams of The Boston Globe reports.