Jordan Bastian of MLB.com reports that left-hander Rafael Perez is expected to sign with the Red Sox.
Ivan Nova (triceps) could be activated from the disabled list early next week.
Orioles designated RHP Alex Burnett for assignment.
Darin Mastroianni underwent surgery Thursday to repair bone chips on his left ankle.
Orioles purchased the contract of RHP Kevin Gausman from Double-A Bowie.
Orioles optioned RHP Jake Arrieta to Triple-A Norfolk.
Adam Jones will serve as the designated hitter for the third straight game Thursday.
Salvador Perez (hip) is back in Thursday's lineup against the Angels.