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Collyer, 18, is expected to become the first signing under interim manager Ralf Rangnick, who will take up a consultancy role at Old Trafford at the end of the season.
Born in 2004, the youngster leaves the south coast with huge pedigree, having captained England’s Under-16 and Under-17 sides already.
According to italian press, Collyer joins the Red Devils on a three-and-a-half-year deal, with his contract running until the summer of 2025.
Having impressed on trial at Carrington last month, he caught the eye of United scouts at Brighton in a friendly against Huddersfield Town.
A versatile player, the talented teenager can operate in both central midfield and centre-back.
Rangnick previously spoke about how United’s transfer strategy was unclear earlier this season – calling on club chiefs to follow in the footsteps of their rivals.
