The 24-year-old right-back can also play on the left and had already been linked with the Rossoneri in January.
He would be an understudy to Theo Hernandez, so still not guaranteed as much playing time as he’d probably get at West Ham.
Similarly, Calciomercato.com claim that Barcelona are hesitant to let the player go out on loan, preferring to monetise after spending €18m to sign him from Real Betis in 2019.
This too would favour the Hammers, who could afford to splash out on Junior Firpo.
Milan are leaning more towards a loan with option to buy deal and hope the player will prefer to join them, above all with Champions League football.