Jose Mourinho has faced Chelsea twice this season and is geared up for the third meeting against his former club on Sunday.
However, Manchester United play Anderlecht in the Europa League on Thursday night before the Chelsea clash on Sunday, and Mourinho has admitted he still has to play his best side against Chelsea despite the choking fixtures or the media will crucify him.
“I think if we play against Chelsea with the second team you will kill me,” he said.
“The country, the football country, will kill me because when mathematically it’s possible there’s no reason not to try.
“If in the certain moment of the season we have no chances to get the top four and we’re still in the Europa League then there’s a reason that nobody can deny, nobody can criticise because then if we only have the Europa League we have to focus on the league.
“In one week we play Tottenham, Southampton, Palace and then the Europa League final then everyone needs to accept I’ll focus on Europa League.
“Even if we beat Anderlecht we don’t know what will happen.
“We need to continue in the Premier League and show the amazing character until the end.
“Until it is mathematically possible we will fight for top four.”