Victorino, 33, felt the hamstring grab running the bases on a double Saturday afternoon. He only played 10 games this spring after undergoing nerve release surgery in his right thumb in December.
The 23-year-old Bradley is quickly back with the team after he was optioned to Triple-A after losing the center field competition to Grady Sizemore.
A two-time All-Star, Victorino hit a career-high .294 with 15 homers, 61 RBIs and an .801 OPS in 122 games last season, his first with Boston. The move is retroactive to Sunday, but Victorino will still miss a minimum of 13 games.
#RedSox: Nava RF, Pedroia 2B, Ortiz. DH, Napoli 1B, Carp LF, Sizemore CF, Bogaerts SS, Pierzynski C, Middlebrooks 3B and Lester LHP. — Pete Abraham (@PeteAbe) March 31, 2014