“To be able to leave with two championships including the treble last season, these are memories that I will never forget and to be able to achieve them with my home club is something that I am extremely proud of."

Olyroos defender Farrell, 21, is heading to a happy hunting ground for Australians.

Yengi became a Socceroos regular off the back of strong form with Portsmouth last season, where he helped them win the League One title and promotion to England's second tier.

Silvera has just joined the club on loan from Middlesbrough while Alexander Robertson also had a loan stint at Pompey.

“Jacob is a fantastic young prospect who joins us on the back of a great season with Central Coast Mariners," Portsmouth boss John Mousinho said in a statement.

“Despite his age, he’s played a lot of games already in his career and we’ve obviously got a decent relationship with players who have come over from Australia.

"He’s an athletic left-back who’s also extremely solid defensively and he brings so much potential, so we’re delighted to have him on board.”

The Mariners have secured a transfer fee for Farrell, who will be sorely missed.

“Although we are disappointed to be losing someone of Jacob’s influence and quality, we are pleased that he is getting this opportunity overseas in a league like the Championship and at a club with the ambition of Portsmouth,” coach Mark Jackson said in a statement.

“Jacob will be sorely missed but we are happy that our players are getting opportunities overseas in strong leagues including the Championship, and that we are able to receive a fee in return. 

"We wish him nothing but the best for the future.”

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