The former Real Madrid midfielder has re-signed for Felix Magath's side on a short-team deal after recovering from a serious knee injury, having been released last summer
The former Real Madrid man was released by the Cottagers in the summer after suffering a knee injury in December that ended his season prematurely.
However, Diarra has since made a good recovery from injury and has been training with Felix Magath's side before being rewarded with a new deal based on the number of first-team performances that he makes.
In his first stint with the club, Diarra made 19 appearances for Fulham, scoring once, after joining them on a free transfer from Monaco in February 2012.
The 32-year-old links up with a Fulham side who are currently bottom of the Premier League with just seven games of the season left to play.