Gary Cliffe, a former youth player at Man City, said Bennell abused him "hundreds of times", and took advantage of his status as a top football coach to molest and rape young players, even abusing Cliffe on the club's Maine Road pitch.
He was found guilty of 36 charges on Tuesday, and a further seven counts on Thursday.
The jury at Liverpool Crown Court had already convicted him of 27 charges of indecent assault earlier this week, along with seven serious sexual assaults and two attempted serious sexual assaults.
During the course of his trial, Bennell was described as a "child molester on an industrial scale" who would groom his victims and their families.
Bennell, who served time in jail for child sexual abuse in the 1990s, had already been convicted of abusing 15 boys in the United Kingdom and one boy in America.
Outside court, previous victim Andy Woodward, who decision to speak out about Bennell's abuse led to the trial, said he was proud to have helped other victims get the justice they deserved.More news: Dumb Celtics tribute made Rajon Rondo and Isaiah Thomas explode
Manchester City said they are also continuing to "exhaustively examine" a number of reports of "historic anomalous behaviours".
"I would personally like, now after 15 months, an apology from Crewe Alexandra for what happened to us boys".
"Barry Bennell is a predatory paedophile who groomed and abused young boys who dreamed of a career in professional football", Jackie Lamb, from the Crown Prosecution Service, England's state prosecutors, said after the trial concluded. We were little boys with a dream and our innocence was shattered.
"As a result of their investigations, the police found no evidence to corroborate that the club was aware of Mr Bennell's offending".
Bennell, who is now known as Richard Jones, appeared in court via videolink during the five-week trial due to illness.
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Mr Unsworth said: "We stand before you today as men united in justice, but this is about so much more than us".
His mother, Margaret, said she holds not only Bennell, but "these people in the clubs" responsible.
Crewe Alexandra said after the verdicts: "Crewe Alexandra would like to express its deepest sympathies to the victims of Barry Bennell".
Boys were abused at his home - including a property in Derbyshire where he had arcade games and a puma and a monkey - on trips away, and in his auto on the way to and from training, they said.
A statement from Manchester City read: "Whilst Manchester City FC is restricted as to what it can make public at present, the club can confirm that to date, the review team has identified serious allegations of child sex abuse in respect of two identifiable individuals with potential historic connections to Manchester City".
But it said the club had been unaware of any sexual abuse by Bennell and no complaints about him had been received while he was employed by the club. The second identified individual - John Broome - is deceased and is not believed to be linked to Bennell.More news: An Unexploded World War II Bomb is Dragged Out to Sea
In a club statement issued Wednesday, Man City offered "heartfelt sympathy" to all those affected by the "unimaginably traumatic experiences" endured at the hands of Bennell.