Man Utd watch Cristiano Ronaldo Jr! Red Devils scout CR7's son during Portugal Under-15 debut but face competition from Europa League rivals Tottenham

The 14-year-old came on as a substitute as Portugal beat Japan 4-1 on Tuesday and The Sun reports that a scout representing United was present as the club continue to keep an eye on the son of their former star.

United are already aware of the teenager's talent after his spell in the club's youth system during Ronaldo's second spell at Old Trafford. However, they are not the only club tracking him, with Tottenham and several Bundesliga clubs also represented in the youth clash in Croatia, in which he wore the No. 7 jersey associated with his father.

The 40-year-old Al-Nassr star congratulated his son on his first appearance for the national youth team, writing in an Instagram post: "Congratulations on your @portugal, debut, son. Very proud of you!"

The youngster will hope to feature when his side face Greece and England in their next matches, while Ronaldo senior and his Al-Nassr co-stars will face Al-Taawon on Friday.