The 31-year-old midfielder is a key part of the first team, which is why Benitez wants him to stay at the club.
But he is free to depart at the end of the season. He can even begin negotiating a pre-contract with clubs abroad in January.
When asked about the player's future, Benitez said to Chronicle Live: "His future is very simple.
"It's the next 90 minutes then after we will talk about more things.