The 21-year-old is currently on loan at Molde after joining United from the Norwegian side during the summer.
United will be monitoring Diouf’s progress at Molde in the last games of the Norwegian season.
Ferguson said: “He (Diouf) is on loan at the moment with Molde and he will stay there until January.
“At that point, we will make a decision over whether to apply for a work permit for him or leave him there for the full season.
“He is a powerful boy, quick as hell, good in the air, 21 years of age and he has done very well at Molde.
“Playing in Norway is similar to playing here in terms of climate, so we don’t have an issue with that either.”