Liverpool have confirmed the signing of Sunderland goalkeeper Simon Mignolet in a £9m deal, the BBC reports.

The 25-year-old signed a long-term contract after a medical late on Tuesday.

He will become Liverpool's fourth summer signing after Manchester City's Kolo Toure, Sevilla's Luis Alberto and Celta Vigo's Iago Aspas.

"I am delighted that we have been able to sign one of the top goalkeepers in the Barclays Premier League," manager Brendan Rodgers said.

"Simon will join a club that will give him an opportunity to demonstrate and improve his huge talent."

The Belgium international has played 101 games for Sunderland.

He kept 11 clean sheets in 40 matches last season for the Black Cats.

Liverpool's current first-choice keeper Pepe Reina, 30, has been linked with a return to Spanish champions Barcelona, where he started his career.