Heaton, who came through United's academy before leaving as a teenager, returned to the club as a free agent from Aston Villa in 2021.
Despite making only three senior appearances for the first team since his return, he has remained a valued member of the goalkeeping setup — praised by the coaching staff for his experience, professionalism and contribution to the development of younger players around him.
His renewal comes at a time when United are actively seeking to restructure their goalkeeping department. First-choice Lammens, 23, has established himself as the leading option, while Bayındır, 28, serves as the senior backup. Heaton's presence provides continuity and an experienced voice in a position where institutional knowledge is considered valuable.
The extension is a straightforward piece of squad management rather than a statement signing — but it reflects United's view that the experience of a player who has spent much of his career in the top two divisions of English football remains worth retaining as the club prepares for a return to Champions League football next season.