McTominay is not the only example of a player leaving Manchester United and suddenly finding success. Antony has been reborn at Real Betis, producing dazzling displays in La Liga, while Marcus Rashford spearheaded Aston Villa’s European surge, firing them close to a Champions League semi-final before Barcelona swooped in to sign him. This recurring trend of letting players go too early only to watch them thrive elsewhere is making United cautious. They do not want another talent slipping through their grasp, especially one with the potential ceiling of Mainoo.