Manchester United are reportedly keeping a close eye on Famalicao youngster Gustavo Assuncao.
The 20-year-old, who captains his Portuguese club, has made 46 appearances for Vila Nova since leaving Atletico Madrid to link up with the Primeira Liga outfit.
According to AS, Assuncao's performances for Famalicao have caught the attention of United, who have been 'carefully examining' his form in the early stages of the 2020-21 campaign.
Assuncao has a contract in Portugal until June 2025, but it has been suggested that an offer in the region of €25m (£22.6m) in either January or next summer would be considered.
The holding midfielder is the son of former Porto and Atletico midfielder Paulo Assuncao.