Swansea City have signed Celtic striker Adam Idah for an undisclosed fee which is believed to be an initial £6m.

Idah, 24, becomes the most expensive signing ever made by Swansea when not in the Premier League, with the transfer fee potentially rising to £7m.

The 32-cap Republic of Ireland international has agreed a five-year contract with the Championship club.

“Adam’s all-round ability and his experience at the highest level make him a quality addition to our squad, and his signing is an indication of our ambitions for the club moving forward,” said Swansea head coach Alan Sheehan.

“He is an ambitious young player who wants to play a big role in what we are trying to build at Swansea, and his movement and ability to stretch defences will be a real asset to us.”