The 28-year-old Senegalese international has fallen down the pecking order at Craven Cottage this season due to a combination of injury problems and poor form.
He had impressed in the Premiership however following a move from Lens in 2004 and Jewell is eyeing a loan deal with a permanent transfer to follw if the Latics avoid relegation.
Fulham will offload Diop if they can sort out a deal for Alexei Smertin.
Wigan manager Jewell meanwhile is also running the rule over Chilean trialist Jorge Acuna, also a midfielder.
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