Channel 11 News reporter Amy Marcinkiewicz learned Thursday the third youth came forward within the last month.
After a preliminary hearing Thursday, Henry Sepp, 44, was ordered by a district judge to stand trial on sex crimes against two teens.
Sepp was in court with his wife and family, who insisted he is innocent of the charges.
When asked about the third allegation, Sepp's attorney, Steve Valsimidis, told Marcinkiewicz, "There has been no confirmation one way or the other from the district attorney as to the credibility or even if it's a valid lead. Well, certainly it's a concern, but given by client's position and his denial of the allegations, no."
He said his client is a good person.
"He's scared," Valsimidis said. "There's no denying that, especially for a guy who's never been in trouble before. He's actively involved in the community and he has to consume himself with this stigma associated with these kinds of charges. It's been difficult for him, but he's been getting through it with the support of his family and friends."
Sepp was a youth football coach, as well as co-owner head coach of the semi-pro adult football team, the Western Pennsylvania Warhawks. He lost the jobs when the sex allegations by two teenage surfaced.
Sepp is also the former president of the Beaver County Youth Football league, police said.
The criminal complaint states that two teens, ages 14 and 16, came forward with allegations of sexual abuse. The teenagers told police that Sepp threatened them and their families, police said.
The criminal complaint states Sepp also sent the teenagers nude photos of himself.
The commissioner of the United States Football Alliance previously told Channel 11 that after learning about the allegations, he's banning Sepp from any participation in the league until the situation is cleared up.
Previous Stories: March 26, 2010: Beaver Co. Football Coach, Owner Charged With Sex Crimes