Chelsea wing-back Victor Moses and Watford striker Isaac Success risk Premier League bans.
They both pulled out of the Nigeria squad with injury but the Football Federation are suspicious.
“We know the two players had good games and there was no sign of injury on the duo during or after the game,” an NFF source told Completesportsnigeria.com.
“It came as a surprise to hear later that Moses was injured and that he would not be available for the game and Success finished his team’s game before claiming injury.”
“Honestly, they won’t go unpunished if our investigation turns out as we are suspecting,” added the source.
“In fact, we are considering writing a protest to FIFA if we find out that they connived with their respective clubs to feign injuries and stay away from the matches.”