 He would contract meningococcal meningitis as a member of the Dallas Cowboys during the pre-season which would almost lead to his death and would keep to him out of football for four years.In 1986 the Orlando Renegades of the USFL had Sileo's southeastern territory rights.He eventually tried a comeback four years later playing for the Orlando Thunder of the World League of American Football in 1992, where he was a second team All-League, and helped lead the team to the World Bowl in Montreal, Quebec, Canada, where they lost to the Sacramento Surge 21-17.