Herrera sustained the injury during fielding drills Friday afternoon.
The team will call up Triple-A infielder Eric Campbell to replace Herrera on the roster, according to ESPN NY's Adam Rubin (May 15, 9:11 p.m.)
Sandy Alderson told reporters before Friday's game that Herrera tore his fingernail (May 15, 5:18 p.m.)
Herrera had been hitting .333 with a .391 OBP his last six games, during which Tejada is batting .267.
Campbell is hitting .440 with four home runs and 13 RBIs with Triple-A Las Vegas.