The former Chelsea and Arsenal star is concerned he isn't playing enough first-team football under Jose Mourinho, particularly after the signing of Germany star Sami Khedira.
Diarra was heavily linked with a return to England in the summer transfer window with Tottenham and Manchester United interested in bringing the 25-year-old back to the Barclays Premier League.
Unhappy: Diarra (left) could leave Real Madrid
And the top-flight high fliers have been put on red alert after Diarra admitted he will seek a move away from the Bernabeu if his first-team chances don't improve.
He said: 'I only play once every two matches. I obviously want to play more and if I am not satisfied, I will draw the conclusions.
'I am not at Real to watch the games. I want to play.'
Muntari's clash with Inter boss Benitez opens door to Liverpool and SpursForlan puts Liverpool and Spurs on red alert after revealing he could quitUnited step up interest in Danish goalkeeping sensation Lindegaard