The Guardians, who are off to a 12-5 start, said Avila will not be active Wednesday against the Red Sox but he's expected to join the team's major league roster in the next few days.
Cleveland's pitching staff has been dealing with injuries and Avila's versatility gives the club some needed depth. Avila opened the season with the Padres before being designated for assignment on April 12.
Also, the Guardians said shortstop Angel Martínez underwent surgery on a fractured left hamate bone.
Martinez recently broke his hand on a rehab assignment. The 22-year-old, who is considered one of the Guardians' top prospects, is not expected to return to games for approximately six weeks.
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