Chelsea boss Mauricio Pochettino says Robert Sanchez will be his outright No1.
Sanchez has quickly established himself at Chelsea since bis August arrival from Brighton.
"I think it's very important to have good players in every position, to have that competition for places," Pochettino said
"When I was in Paris I had two big top keepers, Donnarumma and Navas. It depends on their profile and characteristics, professional and personal. What I prefer is to have the best players, and the players that can be compatible between themselves.
"In Paris, we would play Donnarumma for two games and Navas for two games. It's possible, but it's dangerous.
"It's always good for every single club to define who is your number one, but in football the decision is the decision but sometimes coaches want to improve and have different profiles in the squad. Then it is how the player who is not going to play accepts being number two."