Gilmour and Undav didn't play earlier in the season because De Zerbi didn't think they were as good as the automatic starters.
He said as much after the Wolves game -
"After the game I must admit possibly in the past I have made some mistakes with him and Undav, because I did not give them possibility to play. But for me it is difficult to decide to play without Mac Allister, Solly March, Mitoma and Moises Caicedo it is difficult."
Mitoma and Estupinan have played 30+ games this season. They haven't been bedded in.
Take the loss dude.