The New York Yankees are unsure whether shortstop Derek Jeter will be ready for the team's season opener. Jeter needed a cortisone shot in his inflamed left ankle, setting back his rehab and casting further doubt upon his chances to return for Opening Day.

Yankees general manager Brian Cashman acklowledged the possibility that Jeter could begin the season on the disabled list.

"I can't rule it out until we see how the next 10 days goes," Cashman told ESPNNewYork.com Wednesday afternoon at George Steinbrenner Field. "I'm not saying he's going on the DL, but I can't tell he won't be. We've got to do what's right for him and what's right for the team."

Jeter was a late scratch from Tuesday's spring training game against the Phillies after reporting stiffness in the front of his ankle during pre-game drills. He was sent to a doctor Tuesday afternoon, who took x-rays which came back negative, and an MRI which revealed "mild inflammation" in the ankle.

After consultations Wednesday morning, including a conversation with Dr. Robert Anderson, the foot specialist who performed Jeter's surgery, it was decided to inject Jeter with cortisone, an anti-inflammatory that generally takes several days to have an effect.