The Blues are without veteran Ashley Cole and his understudy Ryan Bertrand for the Europa League quarter-final second leg against Rubin Kazan in Russia but Benitez feels he has enough cover in that position.
"David Luiz has also played as a left full-back before so maybe he can be an option," he said.
"I have an idea but we will train today, see how everything is, and after we will decide. I don't think it would be a big problem for Ake if he has to play there. He has played for us and trained with us."