The former Tottenham defender was impressed with the performance of Sanchez against Borussia Dortmund in the Champions League this week.
The 21-year-old defender started the match in Germany on Tuesday evening and played for the entire 90 minutes, as Spurs won 2-1.
Roberts was following the match, and he was blown away by the performance of Sanchez, who joined Tottenham from Ajax in the summer transfer window.
@daosanchez26 simply a sensational player what a signing— Graham Roberts (@GrahamRoberts4) November 21, 2017
What more can I keep saying about @daosanchez26 for his age best centre half I have seen come to the uk simply sensational.— Graham Roberts (@GrahamRoberts4) November 21, 2017
Sanchez seems to have settled into life at Tottenham just fine and has produced some wonderful performances for Spurs so far this season.
The Colombia international centre-back is still very young, and he can only progress and develop in the coming years.
Playing regularly for Tottenham is only going to make the youngster a better player.
Spurs have progressed to the last-16 stage of the Champions League as group winners and are also aiming to win the Premier League title this season.