Gavalas grew up playing soccer and played for the Tasmanian state representative team and the Matildas under-17 national team. She made the switch to Australian rules in 2018, playing for Marcellin in the VAFA.[4] Gavalas was named in the 2019 VFLW team of the year playing for the Western Bulldogs. She was also named the Bulldogs' player of the year.[5]