MK Dons have signed midfielder Samir Carruthers from Aston Villa for an undisclosed fee, following his loan spell at the club last season.
The 21-year-old, who has signed a three-year deal, featured 28 times for the League One side in 2013-14 before a knee injury curtailed his campaign.
He made three substitute appearances during his four years at Villa Park.
"It's exciting and it's what I wanted," said Carruthers, who is currently sidelined with a thigh injury.
"Obviously I know the club from before, I'm pleased to be back and I can't wait to get going again. It's like coming home."
Dons boss Karl Robinson added: "I understand some fans might be thinking 'why have we signed a player who is injured? But we're building for the future'.
"He is part of the long-term strategy here and that's shown with his three-year deal.
"He's an exceptional talent and one day I believe he will be back showcasing his ability at the top."