The 29-year-old has been linked with a move to Manchester United and has only a year left on his contract at Real Madrid.
Diarra is desperate for regular first-team action next season.
“My bosses know more about my future than I do. I am doing the pre-season with Madrid because they are my team and I have a contract,” he said.
“But in football, everything happens very fast – maybe I will go.
“Last season I played only seven games, nothing like that has ever happened in my life before.”