Hume, 19, signed a four-and-a-half-year deal at the Stadium of Light, and Sunderland will be hoping the defender can become a long-term asset.
January can often be a challenging time to do business, yet, while there are some deals which didn’t work out, the Black Cats have made some successful acquisitions.
We asked fans on our social media accounts to name the club's best January signings.
Here are some of the names which were mentioned:
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5. Wahbi Khazri (from Bordeaux - 2016)
Another player who signed for Sunderland under Allardyce and helped the Black Cats survive that season. Khazri made 14 appearances in the second half of the 2015/16 season, scoring crucial goals against Manchester United and Chelsea. Photo: Robbie Jay Barratt - AMA
6. Stephane Sessegnon (from PSG - 2011)
After joining Sunderland for a reported fee of £6million from PSG, Sessegnon spent two and a half years at the club and made 97 appearances for the Black Cats. Photo: Charlie Crowhurst
7. Lamine Kone (from Lorient - 2016)
The third player who came in and made an immediate impact under Allardyce. Kone produced a series of impressive performances during the second half of the 2015/16 campaign and scored twice in a 3-0 win over Everton which secured the Black Cats' safety that season. Photo: OLI SCARFF
8. Ross Stewart (from Ross County 2021)
He's only been here a year, yet the addition of Stewart already looks like a fine piece of business. The 25-year-old striker is the joint top scorer in League One with 15 goals this campaign, as the Black Cats fight to win promotion from the third tier. Photo: JPI Media