Leeds United drew 1-1 with Brentford yesterday evening.
Doukara fell out of favour at Leeds under Rosler, but he has come back into first team contention in recent weeks.
The powerful forward has scored three goals in his last five appearances, and he helped set-up Leeds’ equaliser in a 1-1 draw against Brentford yesterday.
And Evans believes that the 24-year-old is starting to prove his worth, now that he feels valued at Elland Road.
"He was outstanding in the second half," Evans said. "He’s getting fitter, and he’s getting match fitter.
"This kid was discarded and told every day that he was rubbish. You don’t tell him that, because he’s not rubbish. People forget he’s a young man, who’s still learning the British game and he has a big part to play."
Doukara seems to have become Leeds’ second choice striker now, with Mirco Antenucci slipping down the pecking order.
It has led to speculation forming around Antenucci’s future, with the Yorkshire Evening Post suggesting that a clutch of Italian clubs are now chasing the striker.
If Antenucci does leave the Whites, he will do so having made 63 Championship appearances and scoring 15 times.