If Gomes is fit I would definitely start him centrally over Mata but it won't happen. Think Lingard will play just because he seems to do alright against Arsenal. Certainly the weakest United-Arsenal match-up in my living memory.
As long as David Luiz is playing we have a chance.
I mean, going back to that fateful 8-2 day - our First XI included the likes of Jenkinson, Djourou, Traore, Coquelin with stars like Chamakh and Henri Lansbury off the bench.. definitely not the weakest on our side!