Wigan have signed Chesterfield striker Caleb Folan for £500,000.
Former Leeds trainee Folan signed a three-and-a-half-year contract on Friday, keeping him at the JJB Stadium until 2010.
Folan, 24, has scored eight goals in 19 Coca-Cola League One games this season and becomes Paul Jewell's fourth recruit this month.
Jewell said: 'I've watched the lad twice in person while the club has also scouted him on a number of other occasions, and I think he's got what it takes to play at the top level.
'He's strong, he's aggressive, he's got a finisher's instinct and I think he will add competition in an area where the squad needs bolstering.
'I've always maintained I will never buy a player unless I think he can add something to my squad, and Caleb is no different.
'I think the lad's got it, simple as that.'
Jewell has already signed Andreas Granqvist, Kristofer Haestad and David Unsworth in the current transfer window and is still scouring the market for bargains before Wednesday's deadline.
Folan, who has also played for Rushden and Diamonds and Hull, said: 'Every player dreams of being in the Premiership and, although it's difficult for me to leave Chesterfield because the club has been so good to me, this is an amazing opportunity and I want to repay the faith that Paul Jewell has shown by proving that I am good enough to play in the Premiership.
'There are some great players at this club and I cannot fail to improve by being here. Now, I just want to meet the lads, start training and start fighting for my place.'