Manchester United are aiming to sign another central defender before the transfer window closes on August 30.
Leny Yoro joined the club from Lille last month, but the teenager will not make his competitive debut until November after undergoing foot surgery.
The unfortunate setback for the 18-year-old is expected to force the Red Devils into pursuing another central defensive signing before the transfer deadline.
According to El Sevillista journalist Maximo de la Cruz, the club have initiated contact with Mario Hermoso, who is a free agent after his departure from Atletico Madrid.
Negotiations are in the initial phase. The versatile defender is eyeing a three-year deal with a gross salary of £5.15 million per year which equates to £99,000 per week.