Chelsea have been struggling with injuries this season with N’Golo Kante, Tiemoue Bakayoko and David Luiz injured.
Summer signing Danny Drinkwater just returned to the training after being out injured while Luiz is a doubt for Watford despite training with the team on Friday.
When asked if the injuries are compromising his tactics, Conte said: “Yes but when you have the necessity to do this… I’m not happy.
“I’m not happy changing the role of my players.
“I think every player has his own role.
“But, sometimes, you have a situation where you have to adapt and you must be ready to pay for this. It’s normal.”