The veteran midfielder is constantly being linked with a move away from Stamford Bridge but Benitez preferred not to say too much about the chance of a January exit when quizzed on the matter.
"The future of players is always the same. I can't say too much," he said.
"He is fully committed to every training session and every game.
"He is an important player for us but I can't say too much about how he feels (regarding his future). I'm happy with his attitude."