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Last week, Tampa Bay Rays manager Kevin Cash said it was "highly unlikely" that his ace in Shane McClanahan would pitch again this season.

Well, now it is looking like the left-hander will not only miss the rest of this year, but all of next season as well.

Cash announced on Wednesday to reporters that the two-time All-Star will undergo Tommy John surgery.

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Shane McClanahan winding up

Shane McClanahan, #18 of the Tampa Bay Rays, delivers to the Milwaukee Brewers in the second inning at Tropicana Field on May 19, 2023 in St Petersburg, Florida. (Julio Aguilar/Getty Images)

The lefty hit the 15-day injured list two weeks ago with tightness in his throwing forearm, often a precursor of worse problems ahead.

This is McClanahan's fourth trip to the IL in his three-year career and his second this season. He was on the IL from July 1 to July 17 with back tightness. Late last season, he missed time with a left shoulder impingement.

McClanahan was 11-2 with a 3.26 ERA, and he allowed five earned runs in four innings in his most recent start against the struggling New York Yankees.

Shane McClanahan throws

Shane McClanahan, #18 of the Tampa Bay Rays, throws a pitch during the third inning against the Kansas City Royals at Tropicana Field on June 22, 2023 in St Petersburg, Florida. (Douglas P. DeFelice/Getty Images)

He was named an All-Star in July for the second straight season but missed the midsummer classic because of his earlier IL stint. He started last year's All-Star Game and finished in sixth place in AL Cy Young Award voting.

The Rays already lost Jeffrey Springs and Drew Rasmussen to Tommy John surgery earlier this year.

Tampa Bay started the season by winning its first 13 games and went 30-9 in its first 39, but they have since settled down. 

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Since then, the Rays are 42-40. On June 30, they were a season-high 29 games above .500 at 57-28. In July, their 8-16 record was the second-worst in MLB, and since July 1 (entering Tuesday), they are 15-21.

Shane McClanahan

Shane McClanahan, #18 of the Tampa Bay Rays, pitches during the second inning against the Seattle Mariners at T-Mobile Park on June 30, 2023 in Seattle. (Steph Chambers/Getty Images)

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Entering Tuesday night, Tampa Bay sat 3.0 games back of the Baltimore Orioles for the AL East crown, but owned the first wild card spot and were safe of a postseason berth by 5.5 games