"There are so many players out..."
They have also claimed the scalps of Arsenal and Chelsea in the FA Cup and managed an incredible result in the Champions League.
Meanwhile, the Red Devils face Wolves next in the FA Cup at the Molineux tomorrow.
'I don't agree with Gary Neville when he says that teams should go out of this and this (competition) to focus on that.
The 18-year-old made his senior debut for Ole Gunnar Solskjaer's side as a late substitute in the win over Crystal Palace last month.More news: Meghan Markle possibly starting maternity leave
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Despite being heavy favourite to land the job full-time, the club are yet to make an official announcement although Solskjaer is now openly talking about planning for the summer transfer window - including links with Real Madrid winger Gareth Bale, whose future is uncertain following Zinedine Zidane's return to the Bernabeu.
But with Manchester City due to play their quarter-final second leg against Tottenham at home in the same week, UEFA decided to make United host Barcelona in the first leg on 10 April, after stipulating in advance following advice from local authorities that United and City could not play at home on successive nights.
"It's not easy - I don't know if it's easy either - when you're in the media or when you're a supporter, you can think short-term. So there's so many things that we need to think about".
Lukaku suffered the injury after a tackle by Marquinhos in United's win over Paris Saint-Germain nine days ago.
"They were expected to beat us because we had just come into the league, and you could definitely feel that there was tension in the stadium".
'Everything has been going well but football kicks you in the teeth sometimes.