Manchester United boss Ole Gunnar Solskjaer accused Liverpool of trying to kick Marcus Rashford out of the game for Sunday's 0-0 draw.
Rashford soldiered through the game while clearly not fit.
Solskjaer said, "Marcus is a warrior and he's a Manc and he knows what this game means. We had to keep him on, because we already had to make three subs. It seemed like it was their plan, to just kick him, because they kept kicking him from the first minute.
"If that's not an accumulation of fouls I don't know. But he stayed on. His ankle is like a balloon, so it was a fantastic attitude by him. He's angry, because of how many fouls they did on him."
The manager was also delighted with Scott McTominay's performance.
"Scotty played fantastic. He's played in these games before, big games, and he's got a big-game mentality. He's an Academy kid who was up for the game when I put the challenge to him."