Fred Lewis' foul ball off Damaso Marte caromed off Posada's glove, bending his ring finger back at the knuckle. The catcher immediately crouched down and grabbed his hand in pain. Posada said afterward that he wears extra protection by that finger, but that it doesn't always prevent injuries like the one he suffered on Sunday.
"It's going to happen. It's part of the game," said Posada, who was unlikely to catch Monday's series opener in Oakland anyway, according to manager Joe Girardi. "We'll see how it feels tomorrow. Obviously, it's painful right now."
Posada has worked his way back into catching duty after being on the disabled list for two weeks with a hairline fracture in his right foot that was also incurred on a foul ball in May. Posada has also missed time because of pain in his right calf and right knee in April.
"It's frustrating. I'm feeling good at the plate and getting comfortable there," Posada said. "It's just one of those years."
The veteran has started 32 of the Yankees' first 81 games behind the plate. Francisco Cervelli, who has made 45 starts at catcher, replaced him on Sunday.
Tim Britton is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.