Chelsea boss Mauricio Pochettino admits benching Enzo Fernandez for victory over Sheffield United was a technical choice.
Chelsea won 2-0 on the day.
And Pochettino explained: "Only 11 can play.
"It's a big competition and sometimes you need one characteristic. One profile or another profile. I need to choose the player and of course we saw the combination between Caicedo and Gallagher and Cole like a No. 10 was a possibility for the best combination for today.
"It doesn't mean that maybe Tuesday Enzo plays and another is on the bench."