Newcastle United's Aleksandar Mitrovic could face retrospective action after appearing to elbow Manuel Lanzini.
Substitute Mitrovic scored in yesterday's 3-0 win over West Ham United at St James's Park.
However, Match of the Day also highlighted an incident late in the game involving Lanzini.
Mitrovic appeared to aim his elbow at the midfielder late in the game.
As referee Neil Swarbrick missed the incident, Mitrovic could be punished retrospectively with a three-game ban.
MotD pundit Phil Neville said: "He's in big trouble.
"It's a red card. It's nasty, violent, and I can't understand it. At 2-0 up, (Newcastle were) cruising in the game.
"That's a deliberate act, similar to (Marko) Arnautovic last week at Southampton. No need to do it. It's dangerous play, and not needed on the football pitch."
However, West Ham manager Slaven Bilic played down the incident.
“I didn’t see it," said Bilic. "Nobody saw it because it was off the ball. There’s no point talking about that."