sentences:  In his A-League debut against Perth Glory on 10 October 2015, O'Donovan opened the scoring in the game finding the net after a shot from Fábio Ferreira was rebounded to him by the glory keeper Ante Covic.The Mariners won the match 3–2.On 31 December 2015, O'Donovan was involved in an incident in a match versus the Wellington Phoenix, where he deliberately head-butted Phoenix defender Manny Muscat in retaliation for an off the ball elbow he received from the defender, O'Donovan was sanctioned during the match for the act as the referee awarded the player a yellow card.