ongaro first played for rugby casale (1994/95-1997/98), spending the most prolific time of his career at benetton treviso (1998/99-2005/06), where he won 5 italian championships (1998/99, 2000/01, 2002/03, 2003/04 and 2005/06), a cup of italy (2004/05) and a supercup (2006). he moved to saracens, in england, where he played from 2006/07 to 2009/10. he has played for aironi since 2010/11.