Stoke City have signed England goalkeeper Jack Butland from Birmingham City for a fee rising to £3.5m, but will spend the rest of the season with the Championship side.
Blues were keen to sell the 19-year-old because of their financial problems.
Butland signed a four-and-a-half-year contract before being loaned straight back to St Andrew's.
"I've got unfinished business there and I want to help them this season. They have been very good to me," he said.
Butland had because he wanted regular first-team football.
"It's been an incredible day - a very exciting one, but I'm glad it's finished," he told BBC Radio 5 live.
"I love playing and I don't want to sit on the bench. For me, it was important I went to a club where I can play and develop my game."
Butland was called up to the England squad for Euro 2012, after third-choice goalkeeper John Ruddy broke a finger, even though he had spent the season on loan at League Two side Cheltenham.