Vick beat the second-year passer to the starter's job during the pre-season, but has missed five games after picking up the injury last month, allowing Foles to lead the team to four wins in his absence.
The head coach told reporters: "Those guys understand how this thing is put together, in that the same thing that I told Nick in August is the same thing I told Mike today. He's a chinstrap away from having to go in again. We need to get him back up. The big thing with Mike is that he's missed a fair amount of time here, so we've got to get him back up to speed.
"[Foles has] got a great command of what we're doing and he's a lot more comfortable with what we're doing. It's just kind of an ongoing process for him.
"[Vick has] a great teammate and great leader and he's been great for Nick over the games that he's been out in terms of helping him develop. We've got a good situation. I think we've got two quarterbacks who can win games in the NFL and I think you need both of them."
The Eagles face the Arizona Cardinals this weekend.