Central Coast Mariners confirmed on Wednesday that the 24-year-old had signed with the club for the upcoming 2020-21 season.

It's exciting news for the former Ballarat Red Devils player, who has played with Melbourne Victory and Brisbane Roar previously.

"I'm really excited, I'm over the moon to be honest," Nigro told the Mariners' website.

"It's a great opportunity for me. I feel excited to be part of the club and I've loved my time here to date. I've been here for 4-5 weeks now and I've enjoyed every minute of it."

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From 2015 to 2018, Nigro made 26 senior appearances for Victory - including in the 2017-18 grand final success - and then played nine more matches for Brisbane Roar before being released. He joined Green Gully for the 2020 NPL season, which was eventually called off due to COVID-19.

"I've got a fair bit of experience at this level," Nigro said.

"I've been part of a championship-winning team which is the biggest achievement in this league. It's a joy to be back and I can't wait to get started against Newcastle on New Year's Eve."

Nigro was invited to trial but first had to take himself to Darwin to complete two weeks of quarantine before being able to arrive in New South Wales to link up with the Mariners.

Mariners head coach Alen Stajcic spoke glowingly about Nigro and was pleased to have him on board for the upcoming campaign.

"We are all very happy to have Stefan sign with us here at the Mariners and it's a credit to him for the way he has conducted himself so far," Stajcic he told ccmariners.com.au.

"He showed a lot of commitment with undertaking the quarantine period and he has shown similar determination, professionalism and hunger throughout his trial at the club.

"He's got plenty of experience at this level and he also brings defensive quality to our backline at either full back position."