The ex-Spurs owner did not hold back in his assessment of the Belgian midfielder.
The 28-year-old could find himself in hot water with the Football Association following images which appeared to show him eye gouging the Blues marksman midway through last night's feisty 2-2 draw at Stamford Bridge.
At the time, Spurs were leading 2-0 and looked on course to move back within five points of Premier League leaders Leicester City, though the Lilywhites' second-half collapse saw Mauricio Pochettino's side surrender the title.
Sugar was beside himself over the fact that Dembele jeopardised his team's chances of victory by making such a gesture, and he pulled no punches of his assessment on Twitter shortly after it happened.
Pundits recon it's a 3 match ban for Dembele when the video is studied by the authorities— Lord Sugar (@Lord_Sugar) May 2, 2016
Can't argue with that he's a bloody idiot can't control himself https://t.co/NvftipK6Y4— Lord Sugar (@Lord_Sugar) May 2, 2016
If charged and found guilty, Dembele may join Dele Alli on the sidelines after the 20-year-old was slapped with a three-match ban for punching West Brom's Claudio Yacob during last week's 1-1 draw at White Hart Lane.
In addition to that, Pochettino's side could be decimated further if any action is taken on the post-match melee between a number of Chelsea and Spurs staff.