Jeter has patellar tendinitis and will skip Sunday's game against the Royals. From MLB.com:

"I think [he'll miss] just [Sunday]," Torre said. "He has irritation. It's the same knee, same problem. Another team doctor took a look at him when he came out of the game, and just a day off hopefully will do the job." ...

"It is just something that he has been dealing with, and I think he is at the point now where is having trouble dealing with it," Torre said, "even though if you put his name in the lineup, that is where he will go. But hopefully, the couple days off will help him feel better.