Diouf spent the second half of last season on loan at Rangers and has now had his contract paid up by Blackburn at the start of this season. Brown has work with Diouf at Bolton and invited the frontman to come and train at Preston.
The Senegal international is likely to be here for the week before he fixes himself up with a club. It is thought that Leicester are the main party interested in signing the frontman. Brown ruled out any form of deal for Diouf staying at Preston.