Simon Mignolet was named the Black Cats player of the season in an otherwise disappointing season for Sunderland, making 38 league appearances with 11 clean sheets.
Simon Mignolet is set to challenge Pepe Reina for the goalkeeping slot, as Reina has stated he will remain at Liverpool unless ‘a big club’ come in him.
He becomes the first Belgium to join Liverpool, with Brendan Rodgers welcoming Simon Mignolet to his squad.
“I am delighted that we have been able to sign one of the top goalkeepers in the Barclays Premier League,” said Rodgers.
“Simon will join a club that will give him an opportunity to demonstrate and improve his huge talent.”
Simon Mignolet is considered as one of the best young shot-stoppers in Europe, with Arsenal also holding an interest in the 24-year-old.
The Belgium international becomes Liverpools fourth summer signing having already agreed deals for Kolo Toure and the Spanish duo of Luis Alberto and Iago Aspas.