Wales midfielder Jason Koumas has completed his £5.3m move from West Brom to Wigan.
Koumas has got his wish to return to the top flight
The 27-year-old has passed a medical and agreed terms on a four-year deal.
Wigan manager Chris Hutchings said: "Jason is a touch of class and I am convinced he will add a new dimension to the team.
The playmaker said Hutchings was vital to his decision to join, saying: "He has his own ideas and I was impressed with how he plans to set up his team."
Koumas said it would be a "great challenge" to be back in the Premiership.
"When you get to my age you want to test yourself against the better players and teams.
"I am confident in my own ability and have nothing to prove. I am looking forward to showing what I can do."
Hutchings said he was especially delighted with the capture of Koumas as there were "a number of other Premiership clubs" who wanted to sign him.
The deal represents a £3m profit for the Baggies, who bought Koumas from Tranmere for £2.25m in 2002.
West Brom chairman Jeremy Peace said: "We have said all along we will only consider selling players like Jason if we receive head-turning offers."
The Baggies turned down previous bids from Birmingham and Fulham, who offered cash plus players.
Koumas becomes Hutchings' fifth signing of the summer, following Titus Bramble, Mario Melchiot, Antoine Sibierski and Carlo Nash.
"We've pushed the boat out to get Jason but now we turn our attention to other targets," said Hutchings.
"We've done well in the transfer market so far but there's still room to improve the squad further."