Manchester United will look to extend their unbeaten away record against Chelsea at Stamford Bridge, with a change in attack.
Solskjaer backs Martial at United
United boss Ole Gunnar Solskjaer admits striker Anthony Martial is going through a "difficult patch" but he expects him to find form.
The French international has found the net only seven times in 32 games this season, scoring just three since the turn of the year.
"Anthony knows what we want and he's working really hard to do well for the team - that's what's pleasing me," Solskjaer said of Martial after United were drawn against Milan in the last 16 of the Europa League.
"I see him every day in training. He's not going to sit down and wait for things to happen, he knows he'll have to make it happen himself.
Martial is expected to lead the line for United against top-four rivals Chelsea on Sunday, in a game you can hear live on Off The Ball with Damien Delaney and Stephen Doyle on commentary.
Solskjaer is expecting the race for the Champions League places to go to down to the final few fixtures of the campaign.
"Yeah I think so. I think it's going to be a long run in. I don't think the positions will be decided early.
"With this season as well, it's unpredictable. We've seen teams going through bad phases, then a run.
"Who knows what's going to happen with injuries, with how players react to the circumstances, because it's the shortest long season ever, with loads of games.
"So for me, every game is massive and of course Chelsea we know how difficult that's going to be and how important it's going to be for us."