Perez was added back to the Red Sox's roster for the ALDS after being left off the wild-card squad.
Perez didn't do anything special this season, posting a 4.74 ERA and 1.51 WHIP in a swingman role. He'll make the team as a left-handed relief option while Darwinzon Hernandez will not, potentially due to Perez's ability to soak up more innings if necessary.