Manuel Ugarte is facing a potential ban following his 'headbutt' on Kai Havertz during Manchester United's FA Cup win over Arsenal.
Man United beat Arsenal 5-3 on penalties to book their spot in the FA Cup fourth round.
The cup tie burst into life in the second-half as Bruno Fernandes opened the scoring, with his side then being reduced to 10 men following Diogo Dalot's dismissal.
Gabriel levelled proceedings as Arsenal had a golden chance to take the lead when they were awarded a controversial penalty.
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But Martin Odegaard's penalty was saved by Altay Bayindir.
Moments before Odegaard fluffed his lines from the spot, a melee broke out as Ugarte clashed with Havertz, who won his team's penalty.
Ugarte appeared to land a headbutt on Havertz, with Man United fans thinking they know why their player took action.
The incident seemed to go unnoticed by referee Andy Madley, who took no action in Sunday's match.
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But Ugarte could be given a three-match ban if his actions are considered violent conduct, according to the Mirror.
If Ugarte is hit with a suspension, then it would be a huge blow for Ruben Amorin, who has started the Red Devils midfielder in their last two games.
The Uruguayan is an important cog in Amorim's tactical-wheel, having played under him at Sporting CP.
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After the game, Amorim told the club's website: "I think we play, especially in the first half, we play better [than] in the first game. We were better in set pieces today, more aggressive. We show different spirit, even with 10 men. We are improving on that aspect.
"I think we had a lot of difficulties in the beginning of the game to control the game with the ball and then we suffered, not big opportunities, but we suffered running after the ball, especially to switch of play, to win the first pressure of Arsenal. But then we can take in this moment, take the game to a different level when we talk about aggressivity.
"And that is a very good thing. We managed to score and then I felt in that moment we were able to improve with the ball, but with the [player] sent off [it] was really hard on us. And then we suffered all together, defending very well, with some opportunities from Arsenal.
"The players were really tired, but I felt since the first minute that today was our day. And I felt also a connection with our fans, our staff. It was a very good day for us in that aspect. We need to improve the way we play football."
Topics: Ruben Amorim, Manchester United, Arsenal, Football, Kai Havertz
Nasir Jabbar