Oakland A’s closer Trevor Rosenthal underwent thoracic outlet surgery on Thursday and will miss 12 weeks, the club announced.
The A’s put Rosenthal on the 60-day injured list. Rosenthal underwent the surgery in Dallas and will remain there until Sunday. He’ll be re-evaluated in eight weeks.
Rosenthal was diagnosed with severe neurovascular compression. The procedure involved the removal of his first rib, the club said.
Rosenthal, who signed a one-year, $11 million deal with the A’s in free agency, had yet to pitch for the club in the regular season after appearing in four spring training games.
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He was put on the 10-day IL with a shoulder injury last week.
The 30-year-old Rosenthal posted 11 saves and a 1.90 ERA in 23 relief appearances in 2020 in stints with the San Diego Padres and Kansas City Royals. He has posted 132 saves and a 3.36 ERA in his career.
–Field Level Media