Central Coast whiz-kid Mickey Neill is set to sign a new contract with the Mariners following a hugely impressive start to his A-League career.

The attacking left-back has been a shining light in a difficult campaign for the club and after just six senior appearances the board has moved swiftly to offer Neil an improved deal it expects him to sign after Saturday's clash with Wellington.

Neill is the latest product to progress from the Mariners' youth system and having lost the likes of Tom Rogic, Bernie Ibini and Mat Ryan in recent years, coach Phil Moss is keen to stop Neill becoming the latest player to walk through the exit door.

"We're renegotiating at the moment, but that's in its final stages and I expect that to be finalised in the next few days," Moss said.

"Mickey is a great kid, still very young, but he is willing to listen and learn. We're delighted with how he's performed this year.

"He squeezed Josh Rose out of the left back spot and for a young player that is no mean feat."

Despite his tender years and slight frame, Moss said he never had any doubts Neill could step up to the A-League and predicted a big future for the young Sydneysider.

"I am not at all surprised by how well he as gone," he said.

"I wanted to put him in the side last year, but he picked up an unfortunate injury which held him back a bit. But he has got stronger and more confident with each game. He's a joy to work with."

Midfielder Glen Trifiro has also committed his future to the Mariners after putting pen to paper on a two-year deal on Thursday.

The 25-year-old joined the club last February and Moss said his recent performances merited an upgraded contract.

"'Tricky's' come into the game relatively late, but is a great pro who works hard at his game," Moss said.

"He's done very well for us this year and is a player I see very much as part of our future."