Bellusci was at fault for the second goal that Leeds conceded in their 2-1 defeat to Rotherham away from home at the AESSEAL New York Stadium on Saturday afternoon.
In the 89th minute of the match, the 26-year-old central defender attempted to clear a cross with an overhead kick, which led first-choice goalkeeper Marco Silvestri to concede a penalty and receive a red card.
Rotherham scored from the spot kick to win the game 2-1, and Bellusci ended the match in goal.
Silvestri will miss this evening’s Championship game against Queens Park Rangers at Elland Road due to suspension, with 19-year-old goalkeeper Bailey Peacock-Farrell to make his full debut for the Whites.
Evans has revealed that after the match, Bellusci apologised for his mistake against Rotherham.
The Leeds head coach has also disclosed what another assistant manager thought of the performance of the Italian centre-back.
“I spoke to an assistant manager of another club who watched the game and his view was that until the mistake, Bellusci hardly put a foot wrong all day,” Evans told The Yorkshire Evening Post. “He’s been good for us recently, I don’t think anyone can deny that.
“I thought Sol Bamba was close to his best and did a good job on Leon Best so I’m not going to be overly critical.
“The fact is that Bellusci committed a cardinal sin at the end and he knows that. He came into the dressing room afterwards and the lads accepted an apology from him.”
In 23 Championship appearances for Leeds so far this season, Bellusci has created eight chances, has a pass accuracy of 72% and a shot accuracy of 30%, and has won 34 headers, nine dribbles and 44 tackles.