Ahead of their Champions League clash with RB Leipzig, the manager said: "It's going to be a long season and the depth of our squad is better now. Last game Donny, Nemanja and Paul (Pogba) all started on the bench - they're all experienced international footballers. It's not easy.
"But we have so many games this season and they're all going to play a big part, nobody will be able to play all of them.
"They work well as a team, is it two, three or four? And who's on form? Who needs a break?"