Headley, 29, only hit .250 in 2013, after winning a Gold Glove, finishing fifth in the National League MVP voting and leading the NL in RBI in 2012.
"My guess is it's not as severe as that was," Headley said, according to MLB.com. "I expect it to be two or three weeks. I guess the silver lining is it will help the rest of my body heal."
This season, Headley is hitting .188 with two homers and seven RBI. CORCORAN: April performances often indicate who is and is not an MVP candidate