I think my ideal line-up for this game would be:
de Gea
Dalot Smalling Lindelof Shaw
Herrera McTominay
Lingard Pogba Sanchez
Rashford
We need to try and get some energy and pace in the team, along with getting Pogba into the penalty area more often. We can't put crosses into the box because no one is going to win a header, so we need Pogba to break forward at every opportunity and take it in turns with Lingard/Sanchez/Herrera/McTominay to get in Jorginho's face and stop him keeping Chelsea in possession. Young is just poor lately and while Dalot didn't have one of his better games last time he played, I think we should just roll with him and Shaw at full back to get forward. Playing both Herrera and McTominay deep should give our defence a bit more help against Hazard as someone should always be able to stand him up one on one while the rest are back as cover.
I think it's time we gave Sanchez a start as his movement looked great in the closing stages against Barcelona but we've just not had enough creativity or confidence to find him. He looks full of running, must be training rather well and has had a couple of substitute appearances, so I think it's time we gave him an hour. Lingard has looked shot of confidence, but I'd still trust him more than Martial or Mata as it stands (especially the former as he looks scared to attempt a take on). Lukaku's touch is just abysmal and seemingly more than ever at the moment, I don't think we can risk that in a game like this. Rashford isn't in good form either, but he's basically our only player who can lead the line right now so it has to be him.
I'm saying 2-1 United, but it's going to be nervy.