Ibaka is a physical presence around the basket who relies on his athleticism, not practice with the team although conditioning might be a minor concern. If he can play at all, due to a misdiagnosis or extremely fast recovery ability, he will probably get some minutes to see how it goes. He runs the risk of a re-injury.
The Spurs must figure out how to take advantage of his injury. If he is not as mobile, then you have to try and run him to death, depending on who he is guarding or if they play a zone to protect him.