The France international moved to the Bernabeu in January 2009 from then Premier League side Portsmouth and had initial success.
However, the 26-year-old struggled to hold down a starting spot last season under Jose Mourinho and has been constantly linked with a move away.
Premier League pair Manchester United and Tottenham as well as Serie A side Juventus
have all been linked with the player, but his agent John Williams has dismissed speculation Diarra will quit Real this summer.
He told French magazine Le 10 Sport: "Contrary to what is being said, Lass does not want to leave Real Madrid,.
"He has two years left on his contract and is feeling well in Madrid.
"I have not opened negotiations with any club in either England or Italy, but if there is a great offer then we'll study it."