I think one game is the best case scenario. That's what Mendy got earlier this season but I'd argue this is considerably worse since he filmed an unsuspecting person for his racist video, rather than made a joke with a teammate who didn't see anyhting wrong with it. They'll decide by the 14th of March so a three-game ban at that point would see him miss the six-pointers with Manchester and Sheffield United and the derby with West Ham.
Bernardo Silva, not Mendy*
And he got 1 game ban so expect the same for Dele.