As per the claim, a transfer free of £70m has been agreed by both teams for the mid-fielder.
United view Niguez as the potential replacement for Paul Pogba, who is likely to depart the club in the summer.
Diego Costa has an outside chance of leaving Atletico
Atletico forward Diego Costa has struggled at the club since rejoining Los Rojiblancos for €56m in January 2018. The Spaniard may be heading out of the side as manager Diego Simeone would prefer getting a better option to support Alvaro Morata.