The 30-year-old was replaced by Diogo Dalot in the 52nd minute and Ole Gunnar Solskjaer admitted after the dramatic 3-2 victory that he feared Sanchez may have damaged his knee ligaments which would rule him out for a significant portion of their run-in.
United still had one more goal up their sleeve though - a strike in the 88th minute by Lukaku that gave Ole Gunnar Solskjaer's men their 17th win of the season.
During his time as a United player, Solskjaer lived in a five-bedroom mansion in Cheshire worth £4m.
They're confident going into the game, even knowing we're 2-0 down. Gunn saved a poor stoppage-time penalty by Paul Pogba but the Frenchman's blunder did not dampen the mood at Old Trafford after Solskjaer stretched his impressive league start to 10 wins and two draws. "But we have got eight straight away wins from home".
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Beijing has accused Washington of a politically motivated attempt to hurt a potential competitor to US technology vendors. Extradition proceedings are to go ahead against Chinese technology company executive Meng Wanzhou .
The ex-Arsenal man was limping heavily as he left the stadium leaving Solskjaer with more selection headaches ahead of the trip to Paris Saint-Germain on Wednesday. We're playing against one of the best teams in Europe with some absolute quality players but who knows, this has happened before.
"He has been on a good run but he has been an important player for us and will bounce back".
"This was the ideal team to beat today and we knew before the game it was like a final", said Andone.
"I've been part of that so many times myself".
"They know they're part of a special club that can do something like this".
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In a game of spectacular goals, Saints midfielder James Ward-Prowse struck a superb 25-yard free-kick, awarded for an Ashley Young foul on Armstrong, into the top left-hand corner of De Gea's goal after 74 minutes to make the score 2-2.
"I'm so pleased for him, so happy", he said.
Pereira showed his strength to hold off challengers in midfield before slipping through an excellently-timed pass for Lukaku who finished clinically from 15 yards.
Just like Mourinho, Solskjaer was put up in the Lowry Hotel by United when he took over as manager. These three centre-backs should be seen as the flawless and most realistic candidates, especially when you consider the incredible defensive contributions they have produced for their respective teams.
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Nadler said impeachment proceedings are a "long way down the road", and the Judiciary Committee is going to first "initiate proper investigations".