Jose Mourinho appeared less than impressed with Manchester United's travelling support and their confusing choice of songs during the win over Sunderland.
The veteran striker scored his 28th goal of the season to help United to a 3-0 win over 10-man Sunderland on Sunday, with Henrikh Mkhitaryan and Marcus Rashford also on the scoresheet.
United-who started with Sergio Romero in place of goalkeeper David De Gea because of an unspecified problem-controlled the opening exchanges and had plenty of possession in the hosts' half without particularly threatening.
Twitter user @oibanji posted a short clip which showed Mourinho questioning the chant with a quizzical look on his face.
"Luke was one of a number of positive performances", he said.
They're now in fifth place, four points off the pace of the top four behind Manchester City, a club with which they have a game in hand. "Physically he showed, of course, unbelievable conditions and Thursday [against Anderlecht in the Europa League] he will be there again". Sometimes it's more hard but sometimes it gives you the advantage because you have one more.
The picture is bleaker for their former boss Moyes and Sunderland who have now gone seven top-flight matches without scoring - the joint second worst sequence in Premier League history.More news: No merger until Sasikala, Dinakaran resign from AIADMK: OPS faction
The big forward returned from a three-month injury spell in the Black Cats' 3-0 home defeat against Manchester United on Sunday.
"He was very good, " Mourinho said. "I don't want to really focus on the referee but I think the decisions today had an impact on the game".
"It's going to take me a couple of games, I wish I had time, or we had time, but we don't, " he continued.
With the EPL's top four all having won on Saturday, it was essential for United to return to winning ways having been left disappointed by home draws in its previous two games.
"Every player should receive some criticism because we aren't flawless, so we have to accept the criticism from the coach and keep on working because the most important thing is to work and improve and gather experience".
"Most of the players at Manchester United are young - we are here to learn", the Ivorian global told the Premier League, relayed by The Mirror.