Manchester United are reportedly closely monitoring Watford defender Pervis Estupinan.
The 22-year-old joined the Hornets from LDU Quito in 2016 but is yet to make an appearance for the English outfit, spending time out on loan at Granada, Almeria, Mallorca and Osasuna.
Estupinan has been in impressive form for Osasuna during the 2019-20 campaign, contributing one goal and four assists in 26 La Liga appearances.
According to Espreso, United have been keeping a close eye on the left-back's performances during the current season and could make a move during this summer's transfer window.
Atletico Madrid have also been credited with an interest, while several clubs from Italy are also said to be exploring the possibility of signing the Ecuador international, who, as it stands, is also due to spend next season with Osasuna.