United rejected Roma’s latest offer for Smalling, who was a great success on loan at the capital club last season.
And in recent hours, they have switched their attention to Kumbulla, Verona’s much sought-after central defender.
Kumbulla has been ‘close’ to joining Juventus, Inter and Lazio, but no club has managed to complete a deal.
Roma are now on the brink of securing the 20-year-old on loan with an obligation to buy for €30m.
Sky Italia add that Kumbulla’s arrival won’t necessarily rule out Smalling’s arrival, but talks with United are proving difficult.