The incident occurred when an innocuous passage of play flared up in Poland, with Dembele pushing over Wisla's Gervasio Nunez after he caught him on the back of the ankle.
The Argentinian midfielder went down clutching his face despite being pushed at shoulder height, leading referee Martin Hansson to hand the Belgium international a straight red card.
The Cottagers face the Polish champions once again on Thursday in Europa League Group K and Jol is keen to make amends for an "awful night" in Poland.
"I would have a word with [my player if they did what Nunez did] because it is not our style, he said. "You won't see that in our team.
"I felt the [referee] was quite experienced so it is about momentum.
"He has to make these decisions and probably in hindsight he would have seen it [was a mistake] because it was the fourth official that probably called it.
"It is a bit of teamwork so I don't want to blame him but it was certainly an awful match.
"If we had got a result we would be fine, you know?
"But we got reduced to 10 men and lost so it was almost like everything was for nothing and that was awful."
He added: "I told everybody what I thought about it [at the time]. The only other thing is [Dembele should not have raised his hands]
"The rules are if you raise your hands, you are probably going to get a red card and that is what happened.
"But I still feel we were hard done by because it was not even a push on the chest or the face, it was on the shoulder."
While Dembele is banned for Thursday's match, Jol is expected to name a strong side as his side look to avoid a repeat of their 1-0 defeat in Poland.
The result at Stadion Miejski leaves the Cottagers second in Group K, three points behind Dutch outfit FC Twente.
Both Odense BK and Wisla lie within a point of Fulham and Jol admits it is important to get a result against the latter.
"It is important for most of the teams to quality, although English teams will say it is not the biggest thing in the world," he said.
"I think Fulham raised their profile in Europe a couple of years ago [when they reached the final]so there is a culture in this squad that they want to do well and I agree with that.
"Twente play a weaker team in Odense tomorrow so we have to take things in our hands.
"If we get a good result tomorrow we are halfway there."