The 45-year-old has agreed a two year contract and will be joined at Sunderland by his backroom staff Mauricio Taricco and Charlie Oatway.
Sunderland chairman Ellis Short said: “We analysed a wide range of candidates and believe that Gus’s track record, experience, commitment and passion make him the right man to take us forward.
“We welcome him to Sunderland.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.