I actually think Pep would be more comfortable playing Rico Lewis than he would Gomez. More likely to be Ake at left back with Laporte, Akanji and Lewis completing the back 4, imo. Lewis’ start to life at City has been at a higher level than Gomez’s.
If Gomez doesn’t get minutes in this game then he’s got no hope IMO. He should be fitter than the majority of the squad and it’s a cup game.