Mikel temporarily left the pitch in pain towards the dying minutes of the game, but had to come back in as Nigeria had used up their three substitutes.
On Saturday, Gernot Rohr told KweséESPN the injury was not serious and that Mikel would play. He updated that information on Sunday afternoon.
“Unfortunately there is one injury. We have the captain who has a fracture of the metacarpal, but I think he can play with a cast.
“Our medical team is working on it,” Rohr said in a video posted on the official Super Eagles Twitter handle.
The metacarpal bones form the intermediate part of the skeletal hand located between the phalanges of the fingers and the carpal bones of the wrist which forms the connection to the forearm.
Nigeria departed on Sunday afternoon for Saint Petersburg, where they will face Argentina on Tuesday.