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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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?