Oar has been at APOEL since June last year but has terminated his contract with the assistance of Professional Footballers Australia, making him a free agent.

It's understood the former Socceroos winger will link up with the Mariners.

Oar was on the outer at the Cypriot champions, only playing 19 matches during his first season with the club and being left out of the Champions League squad.

The intervention of the PFA is only seen in rare circumstances, often when a player is seeking legal advice relating to contract relations between themselves and the club.

“The PFA’s legal department has provided advice to Tommy over the past two months,” PFA Chief Executive John Didulica said.

“Tommy has terminated his contract for just cause in accordance with FIFA Regulations and the longstanding jurisprudence of the Court of Arbitration for Sport. Tommy is now a free agent and permitted to sign with a new club.”

Oar is hoping to secure a new contract as soon as possible and continue his playing career.

“I would like to thank the staff and players at APOEL and wish them all the best for the future," said Oar. I thank the PFA for their support during this period, which has been invaluable.”

Oar burst onto the A-League scene as a teenager at Brisbane Roar in 2008 and quickly earned a move to Dutch outfit FC Utrecht, where he spent the next five seasons.

An ill-fated stint at Ipswich Town in England followed, before a brief return to the Roar and then his switch to APOEL.