Celtics coach Doc Rivers said this morning that the reason Shaquille O’Neal didn’t return to the court in the second half of Game 4 was because he was unable to.

Shaq is still bothered greatly by the right calf and achilles injuries that caused him to miss so much action.

“You guys have no idea how much this bothers Shaq,” Rivers said. “This was the whole reason he came back — to win a championship. He wants to be in there more than any of you can know.”