Leeds United academy graduate, Clarke has made four first team appearances for Tottenham Hotspur to date.
The England Under-20 international moved to Hotspur Way for an undisclosed fee in July 2019.
The versatile forward made his Spurs debut for Jose Mourinho’s side in a 3-0 UEFA Europa League victory over Austrian Football Bundesliga side LASK.
He has also picked up prior loan experience back at Leeds, as well as with Queens Park Rangers and Stoke City.
Sunderland AFC (@SunderlandAFC) January 26, 2022
“I can't wait to get started. I'm from this part of the world, so I know this is a massive club and what it means to the fans," Clarke said.
“I'm looking forward to playing at the Stadium of Light and the prospect of being part of the team that takes the club back to the Championship. I want to help the team as much as possible, whether that's goals or assists, and ensure we reach that end goal."
The 21 year-old winger has scored four goals in 18 appearances in all competitions for the Spurs Development Squad.
Lee Johnson speaks
“Jack (Clarke) is a talented player and having followed his progress over the past few years, I feel like he’s really grown on the pitch throughout the past six months and found a maturity to pair with that talent,” Sunderland manager Lee Johnson said.
“The competition for places in our final third is strong and we want to be able to change games as we move into the back end of the season. Jack understands that this is a big club with a lot to play for, but he wants to be an influential player for us and help to ensure we have a successful end to the season.”