Swindon midfielder Louis Thompson has agreed a move to Norwich, while Southampton's Jack Stephens has joined Town on loan.
Huddersfield have beaten the transfer deadline to bring in defender Mark Hudson from Cardiff.
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.