City's squad isn't really that impressive. Chelsea's is weak af beyond their first XI.
Good defensive backups: Sagna, Kompany
Good midfield backups: Gundogan, Toure
Good wing backups: None - potentially Sane but he's been nothing special
Good striker backups: None (I like Kelechi but he's not that good)
Chelsea
Good defensive backups: Zouma
Good midfield backups: Cesc
Good wing backups: Willian
Good striker backups: Batman
Arsenal
Good defensive backups: Gibbs (maybe Gabs but I'll let him slide)
Good midfield backups: Xhaka or Coq depending who starts (also Elneny and Ramsey are better than Chelsea's Loftus Cheek and Chalobah options but again let it slide)
Good wing backups: None, our starters are barely good enough. Lets put Welbeck here though.
Good striker backups: Giroud