Victorino, 33, had offseason thumb surgery and also missed time in camp with a ribcage problem. The hamstring issue popped up in the final days of spring training.
In 122 games last season, Victorino hit .294/.351/.451 (119 OPS+) with 15 home runs, 21 steals and a league-leading 18 hit-by-pitches. His right field defense is also a plus.
Bradley, 23, lost the center field job to Grady Sizemore this spring. He hit .189/.280/.337 (69 OPS+) with three homers and two steals in 37 games with Boston in 2013.