But Di Matteo reckons there will be enough games to go around. He said: "Keeping players happy is an issue that every manager has. It's almost impossible to keep everyone happy. When you don't play you do get a bit frustrated in that sense.
"Towards the end of last season we had some games when we were really struggling, especially the last game, the Champions League final.
"We had suspensions and injury and it was a struggle to get enough players ready for that game.
"But it's a busy season - everybody will get enough football time."