The Belgium international made the comments following Tottenham’s goalless draw with Liverpool at home in the Premier League on Saturday afternoon.
Midfielder Dembele, who is also a Belgium international, started the game and played for the entire 90 minutes.
The 28-year-old gave a good account of himself in the match, which ended in a goalless draw.
The former Fulham star took one shot, had a pass accuracy of 91%, attempted five dribbles, won 75% of his tackles and 25% of his headers, and made five interceptions and three clearances.
Vertonghen was impressed with the performance of his Belgian compatriot against Liverpool and spoke highly of him after the match.
Over the course of the 90 minutes at White Hart Lane, hosts Tottenham had 48% of the possession, took 13 shots of which just four were on target, and earned eight corners.