The former Chelsea and Tottenham midfielder arrives at the Stadium of Light with the club bottom of the Premier League, with just one point from seven games so far this season.
Some Sunderland fans have likened Poyet to former Black Cats boss Paolo Di Canio, believing he is just a 'lighter' version of the controversial Italian.
But that comparison is too simplistic.
Poyet has more managerial experience than Di Canio, who arrived at Sunderland after less than two years in charge of Swindon.
Di Canio was in charge for 95 matches at Swindon (win ratio of 57 per cent), whereas Poyet had 194 matches in charge of Brighton (win ratio of 44 per cent).
And Poyet also served as assistant manager to Dennis Wise at Swindon and Leeds and Juande Ramos at Tottenham.
Many Leeds fans believe Poyet was the power behind the throne at Elland Road as the club - with a 15 point deduction for failure to comply with rules on insolvency after relegation from the Championship and entering adminstration - started the 2007-08 League One campaign with seven league wins in a row.
Poyet left Leeds to become assistant to Ramos at Tottenham in late October 2007, while Wise left to take up a role at Newcastle in January 2008.
But it was at Brighton where Poyet really cut his teeth as a manager.
Poyet joined the Seagulls - then in League One - in November 2009 and steered the club to safety that season with a 13th place finish. Poyet guided Brighton to the League One title in 2010-11 - his first full season at the club - and he was voted LMA League One Manager of the Year.
Albion then finished 10th in the Championship in 2011/12 and fourth in 2012/13, going out in the play-off semi-finals to Crystal Palace. Poyet was suspended by the club for an alleged breach of contract and his subsequent departure was disappointing considering the overall job he had done at the Amex Stadium.
But where I feel Poyet will have the edge over Di Canio is in his man-management skills. The players will no doubt be told of their responsibilities and of the hard work ahead, but Poyet's regime is unlikely to be as strict as Di Canio's, which will be more welcomed by the players.
Time will tell whether Poyet can keep Sunderland in the Premier League, but I feel Poyet will get far more out of the Black Cats squad.