Real Madrid midfielder Kaka has admitted that he may be leaving the Bernabeu if the club no longer require his services.
The Brazilian has struggled with injuries at Madrid ever since his move for €68million in June 2009, and has made just 76 league appearances.
The midfielder is tipped to start in El Classico this weekend as manager Jose Mourinho looks to rest key players ahead of a last-16 second leg tie against Manchester United in the UEFA Champions League on Tuesday.
Kaka has indicated that he wishes to remain at the club and see out the remaining two years of his contract, but accepts that this may be difficult given his lack of playing time, particularly with the World Cup being held in Brazil next year.
"I have two years left on my contract," Kaka said.
"I am happy to continue at Real, but I don't want to be a problem for the club. If I have to go, I will go.
"I don't know if I will get back into the national team, but I have to be prepared. I would love to return. There is still time."
Kaka has 85 caps for Brazil, scoring 29 goals, with his last cap coming in Brazil's 1000th match against Colombia last November.