The Reds have triggered the terms of the deals with two members of the men's first-team goalkeeping group.
Experienced Tom Heaton, who is in his second spell at Old Trafford, played in two matches last term, the Carabao Cup victories against Charlton Athletic and Nottingham Forest, keeping two clean sheets en route to Erik ten Hag's men lifting the trophy at Wembley.
Nathan Bishop is the other keeper, with the 23-year-old staying at United throughout 2022/23 after previously being on loan at Mansfield Town.
Ethan Laird is another player whose contract has been activated for a further year, with the defender back from a season-long stint at Championship side Queens Park Rangers.