The new Black Cats boss is a former Sunderland player.
Sunderland replaced Dick Advocaat today, bringing in a new manager who should hopefully provide survival for the Black Cats despite their poor start to the season.
Allardyce has a good record of keeping unfancied teams in the top-flight and will now be hoping to continue that record with Sunderland.
Allardyce, who departed his unpopular post at West Ham at the end of last season, is also a former Sunderland player - which is helping his early reaction from Sunderland fans.
Allardyce played for Sunderland back in the 1980-81 season - before making the move to Millwall in 1981.
He has alluded to his Sunderland past today in a tweet after the announcement was made. He shared his memories of the 'Roker Roar' through his official twitter account earlier today. He also went on to thank the early well wishers to his new job:
Fond memories of the Roker Roar as a player. Now let's make some positive memories at the Stadium of Light. What a fantastic place to be— Sam Allardyce (@OfficialBigSam) October 9, 2015
Many thanks to all the well wishing tweeters. Much appreciated— Sam Allardyce (@OfficialBigSam) October 9, 2015
The 60-year-old, who has managed in the North-East previously with an ill-fated spell at Newcastle United has signed a two-year deal with the club and is clearly excited to get going.
How long until he signs Kevin Nolan?