The ex-Arsenal man was surprised by what the Belgian did.
Spurs, who led 2-0 at the break, conceded two second-half goals in a result which saw Leicester City crowned Premier League champions after the North Londoners failed to pick up the win needed to stay in the hunt.
It was a feisty affair at Stamford Bridge which could land the Belgian midfielder in hot water with the Football Association, amid suggestions that he eye gouged Blues striker Diego Costa.
A number of Tottenham boys looked visibly frustrated on a night which saw them pick up nine yellow cards - a Premier League record - but Arsenal legend Wright claims that Dembele's behaviour surprised him the most.
"At the end of the day, Vertonghen and that were on his [Costa's] case from the very start. They were winding him, doing stuff, everything they could," he told The Sun.
"Dembele was quite surprising for me because I've never seen him as that type of player but he looked very antagonised."
With Dele Alli already absent for Tottenham, it makes their bid to hold second place from Arsenal all the more tricky if Dembele is hit with a ban of some description.
As it stands, the Gunners are three points behind their North London rivals with two games to go.