The 32-year old Mali international midfielder initially joined the Cottagers from Monaco in February 2012 but has not played for the southwest London club since that year because of a knee injury.
Diarra was released at the end of the 2012/13 campaign but is now back training with Fulham and has signed on for the remainder of the 2013/14 season.
"The 32-year-old was out of action for a sustained period after struggling with a knee injury, but worked relentlessly to regain full fitness. Diarra's short-term contract with Fulham will see his remuneration based on the number of appearances he makes for the First Team.
"The former Real Madrid midfielder initially joined the Whites on a free transfer in February 2012 and he went on to make 19 appearances for the club, scoring once."
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