QPR have rejected a £12million bid from Leicester for Charlie Austin.
Rotherham have signed defender Danny Collins on a free transfer from Nottingham Forest.
The 21-year-old completed his medical on Monday morning and has signed a two-and-a-half-year deal with the Sky Bet League One promotion chasers.
Dicko finished last season at Molineux, scoring once in four outings, but could not prevent the club from dropping out of the Championship.
The former Blackpool and Rotherham loanee failed to find the net in nine appearances for Wigan.