Chelsea boss Mauricio Pochettino says Reece James will learn from his non-playing yellow card.
James was booked during defeat to Aston Villa, despite being injured on the day. The captain was booked for abusing the match officials.
Pochettino said: "It's part of the game.
"He was not satisfied with a situation, and you also have to understand that he has been involved in the project from the start.
"He feels bad that he cannot help the team. He made a mistake. We all do, and he's upset about it.
"I don't think he will repeat that situation.
"I got a yellow card myself against Burnley and I'm 51 years old. Sometimes young kids make mistakes."