The 29-year-old made a £12 million move from Anzhi to Loftus Road in January in a bid to help Harry Redknapp's struggling side avoid the drop but the Rs could not prevent relegation even with the former Blackburn defender, who has now revealed that he was not fully fit.
|13/2||Newcastle are 13/2 with PaddyPower to join QPR in the Championship next season
"There is a big feeling of failure. Most of us came to help the team, believing we could have an impact.
"I don't know [about my future]. I am not the only one who makes these decisions. I have failed to help the team and I only know that I will be much stronger next season."
The centre-back also played down reports that a split at the club between the players brought in recently and those who were part of the promotion campaign is the reason for the club's demise.
"I don't know if we can say it is divided," he added. "What I can say is that, at every club, there are affinities.
"You go into work and you like to sit with specific people, that is what happens, but if everybody respects each other they can work with each other."