The club announced the news on their official Twitter page on Friday, with Cissokho securing a return to the Premier League after spending last season on loan at Liverpool.
Cissokho made 19 appearances in all competitions at Anfield, including 12 league starts as Brendan Rodgers' men finished second.
That temporary deal came after one season at Valencia, where he made 25 La Liga appearances during 2012-13.
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