The 33-year-old Perez was injured while running the bases on what appeared to be a triple in the fifth inning of a game Sunday in Anaheim. His leg gave out as he rounded second base and he fell to the ground. After a lengthy delay, he was taken from the field on a motorized cart.
Perez was fitted with a splint by Dr. Craig Milhouse, the Angels' team physician.
"I'm not a pessimist at all, but I've seen past history on Achilles' tears. As an athlete, everyone who has tears that is a low point of their careers," Perez said.
"As soon as it popped I knew I was in serious trouble. You known when you're down, you're done.
Perez is batting .211 with one home run and seven runs batted in for the Devil Rays this season.