Career
Janonis played as a defender from 1978 until 1990 for FK Žalgiris Vilnius. The 1990/91 season he was part of the Football Club Lokomotiv Moscow squad. In 1991 he moved to Austria where he played for SKN Saint Pölten (1991–1994), Wiener Sport-Club (1994-1995), SV Gerasdorf (1995–1997) and SV Wurmla (1997–2000).
He also capped three times for the Lithuanian soccer team