Oakland Athletics right-handed reliever Trevor Rosenthal went through surgery on Thursday after he was diagnosed with serious neurovascular compression.
The procedure, including the expulsion of Rosenhal’s first rib, a pec minor release and scalene release, was performed by Dr. Gregory Pearl in Dallas, Texas.
Rosenthal will stay in Dallas until Sunday and get back to see Dr. Pearl for a checkup in almost two months, the team said.
The A’s moved him to the 60-day injured list.
The A’s signed Rosenthal to a one-year, $11 million agreement in February with the expectations he could replace nearer Liam Hendriks who signed with the Chicago White Sox as a free agent.
Rosenthal, 30, has 132 saves and a 3.36 ERA more than eight major league seasons.