League OneSunderland have signed Northern Ireland striker Will Grigg for £4m from Championship Wigan.

The Football Association has ratified the transfer after the Black Cats' eighth bid for the 27 year old was accepted very close to Thursday's transfer deadline.

"The club desperately wanted to keep Will but this is an offer we couldn't refuse," said Wigan boss Paul Cook.

"This comes with so much emotional attachment because Will is so popular with our supporters and is somebody who has given everyone associated with the club so many great moments during, not just my time as the club's manager but throughout his three and a half years at Wigan Athletic."