Sky Sports also claims West Ham have made an offer rising to £12m for the Nottingham Forest right-back.
They claim Hammers have bid an initial £10m with £2m more in add-ons – but they face competition from AC Milan and Southampton, among other clubs. Nottingham Forrest are though to want around £18m and are unlikely to let him go on the cheap during the winter transfer window.
He would prefer to stay in England rather than a move to Italy.
The versatile 22-year-old midfielder has excelled this season in an unfamiliar right-back role, with Sabri Lamouchi having moved Cash back into that position following Tendayi Darikwa’s injury.