Mohamed Salah was also spotted having his shirt tugged back by Ashley Young inside the box upon replay, but the Egyptian stayed on his feet and the officials opted against pointing to the spot.
United beat Liverpool at Old Trafford thanks to two first half goals from Marcus Rashford, yet the statistics from the game confirmed that Jurgen Klopp's visitors had dominated most of the key statistics from the game.
Marcus Rashford is confident his development will not suffer from a lack of game time after scoring twice in a 2-1 victory against Liverpool on his return to the Manchester United starting line-up.
Unsurprisingly, Mourinho has not taken too kindly to seeing his methods criticised and has hit back at De Boer, telling reporters: "I read something, some quote from the worst manager in the history of the Premier League, Frank de Boer saying it's not good for Rashford to have a coach like me".More news: Mizzou Basketball's Jordan Barnett Arrested for DUI
"If he was coached by Frank, he would learn how to lose because he lost every game".
"This is not what you expect from a great club like Manchester United, but Mourinho said after the game he doesn't care what anything thinks about him and he always seems to take delight in destroying attacking teams and winning on his own terms".
The Portuguese added: "I try to give the best to the kids, education. I would say he was in the top five with more matches for two seasons", Mourinho said.
"But if you go to his numbers and how many matches he played with me last season and this, I would say probably he's in the top five players with more matches in the two seasons".More news: Relief at British parliament after suspect package given all-clear
"I think we are not one of the best teams in the competition, but I think when a team arrives in the last eight anything can happen. Analysing a performance for me is more than number of goals or assists, and for me I'm really happy with Marcus".
The Englishman is already a fan favourite with many anticipating him to start pretty much any match that he's available for.
'I am really pleased with everything. There are only 11 players that can start - it's just one of those things. Of course not. He's a player we trust.More news: Sevilla boss Vincenzo Montella reveals Champions League tactics