Manchester United have confirmed the signing of midfielder Ander Herrera from Athletic Bilbao.

The Spanish under-21 player has agreed a four year contract after United triggered a buyout clause in his contract.

He is Louis Van Gaal's first major signing as Manchester United manager.

Ryan Giggs on Herrera signing. "We believe he's one of the brightest young prospects in Spain. I'm certain he'll be a big hit." #mufc

— Manchester United (@ManUtd) June 26, 2014