The 24-year-old, who can play as a striker or as a winger, has been on the books of Leeds since the summer of 2014.
The former Catania man has struggled for playing time so far this season, but he played a starring role against Wolverhampton Wanderers away from home on Thursday evening.
Following the match, the former Vibonese player told The Yorkshire Evening Post: “Every player wants to play. To be on the bench was not easy for me.
“Now, I think I will have more game time. I am ready to help the team and to play every game but everybody has to work hard to take the shirt.”
Against Wolves, Doukara took one shot, had a pass accuracy of 77%, created three chances, put in one cross, won 67% of his tackles and 100% of his headers, and made two clearances.
The 2014 summer signing has created seven chances in seven Championship appearances for Leeds so far this season.