Joba Chamberlain expects to be back on a mound in July, according to Yankees general manager Brian Cashman.

The reliever, who suffered an ugly injury to his right ankle in a freak accident on a trampoline Thursday, is likely out for the season with an open dislocation — meaning the bone tore through ligaments and broke through the skin, but CT scan results yesterday revealed no microfractures.

"We're happy about that," Joe Girardi said, adding no further surgery is planned.

The 26-year-old is being held at the hospital until today for precaution against infection.

"He was saying he could be back on the mound in July, that's what the doctors are telling him," said Cashman, who visited Chamberlain at St. Joseph's Hospital on Friday. "That's the optimistic side."

Cashman cautioned, however, there is still no guarantee Chamberlain will pitch again.

"As any orthopedic [surgeon] will tell you, you have to go through the whole spectrum," he said.

That includes the possibility of Chamberlain's career being over.

"That's a concern," manager Joe Girardi said before the Yankees' 4-2, 10-inning win over the Tigers yesterday. "I have a lot of faith in the way Joba goes about his businessand rehabs. We have seen what his pain threshold is and his ability to come back. You look at the elbow and he was ahead of most people's time frame. No one really knows how someone's body is going to heal."