Dembele started in the heart of Tottenham's midfield alongside Eric Dier and the Belgian was brilliant throughout.
The central midfielder dictated Spurs’ attacks, while he also showed his defensive quality during the fixture.
“He was phenomenal,” Jenas said. “Normally I talk about the skill element to Dembele’s game, but he was winning tackles.
“But he did still have the beautiful side to his game. He’s aware.
“He’s just so strong. I’ve trained with this guy, and you can’t get the ball off him. He goes by people at will. You want to get the ball off him, but he’s just so comfortable under pressure.”
In the match against Southampton, Spurs took the lead when Harry Kane scored a wonderful goal.
The England international rounded two defenders before slotting the ball into the net with a composed finish, and Dele Alli then got on the score-sheet moments later, when he tapped in at the far post.
After establishing a two-goal advantage Mauricio Pochettino’s men were rarely threatened, and the win has pushed them up into the top four after Manchester United's defeat to Norwich City.
Tottenham’s next two matches come against the Canaries and Watford, meaning Pochettino’s side have a chance to establish their place in the Champions League qualification spaces over the Christmas period.