Thommo's been reading 6CM (because this is almost exactly what I said earlier) !
Thommo's view: "For me, I would go with Gomez, I thought he was sloppy against Arsenal in the Carabao Cup, but he was excellent against Genk on Tuesday - I watched him very closely, he was back to his best. The reason I would go with Gomez is because you don't need the height as such, but you need the pace against City. I would go with him for our back line - Trent Alexander-Arnold, Andy Robertson, Virgil van Dijk and Joe Gomez, in which you have pace throughout. Raheem Sterling, Sergio Aguero and Riyad Mahrez all have skill, but an abundance of pace - it is a massive part of the City mechanic."
Pace alone won't help if a player, especially a defender, is off form as Gomez has been most of the time since he came back. The more a defender has to use his pace, the more questionable his initial positioning is likely to have been.
That said, if Gomez really is back to his best then yes, he should play.