The 32-year-old is trying to recover from the knee injury which ended his season last December, and the manager suggested improved fitness could see him offered fresh terms
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Diarra is still recovering from the injury, with Fulham allowing him to use their facilities to speed up the process, and Jol has suggested that a new deal could be in the offing depending on his progress.
"Diarra is coming back, he’s probably at 50 per cent," Jol told the Daily Mail.
"He's not really fit but if there’s no contact like in possession games, then he can join us in training. He's not quite there where we want him to be yet."
Diarra played for Fulham for just over a year before his release after signing on a free transfer in February 2012.
Diarra made 19 appearances during his first spell with Fulham, scoring one goal.