The Frenchman suffered a groin injury in the 1-0 victory but immediately eased fears after the game that it was a recurrence of his initial troubles.
"It is adductor, but not the same place," he told L'Equipe. "I felt some pain.
"We played a lot of matches recently so that could be a reason. Before the encounter against Anzhi, I felt fine. I don't think it will be really serious."
Newcastle face Wigan Athletic on Sunday in the Premier League.