Wigan boss Uwe Rosler revealed earlier this week he had received enquiries about French ace Dicko.
Dicko is back at Wigan after they recalled him early from a successful loan spell at Rotherham last month.
The 21-year-old scored six goals in six games at Rotherham and the Millers are thought to be one of the six clubs keen on landing him.
Championship duo Millwall and Bournemouth are also tracking Dicko as well as Rotherham's League One rivals Peterborough, Bristol City and Bradford City.
Dicko, who is out of contract at the end of the season, is thought to be keen on a move away if he is not going to be playing regular first-team football.