Sam Heathcote has signed an 18-month contract with the club following his step up from the reserve side.
The 18-year-old is the son of former Alty player and manager, Graham Heathcote.
He was a junior striker at Manchester United and, following his release, he graduated through Altrincham's youth team and reserves to sign Conference forms, as a back-up for the first-team, in March.
Heathcote made his first-team debut in September, scoring the winner against Cheltenham Town just 90 seconds after coming on as an injury-time sub.
Seven Robins players have been told they will be released at the end of the season.
Jordan Wynter, Omari Sterling-James, Jack Deaman, Zack Zowtica, Joe Hanks, James Bowen and Harry Williams will all be looking for new clubs in the summer.
Of the seven, midfielder Wynter is the only player currently not out on loan.
Manager Gary Johnson said: "We are looking to do what is right not only for the club, but also them as individuals so have made the decision now to give them the best possible chance of finding a club."
The Imps have snapped up free agent striker Craig Reid on non-contract terms.
After being released by Kidderminster Harriers earlier this season, the 29-year-old had a spell at Ryman League side Brentwood Town. He has spent the last few weeks training with the Imps.
Gulls keeper Fabian Speiss will leave the club this week.
The German, 21, has played 17 times and kept two clean sheets for Torquay since signing in the summer, but has not featured since mid-October after losing the No1 slot to Dan Lavercombe.
Meanwhile, it has been agreed that Truro City will share Torquay's Plainmoor ground for part of next season
Truro had hoped to move into a new stadium for the start of the 2016-17 season but delays to the planning process mean it will not be ready.
Having sold their Treyew Road ground to developers, they have had to make the temporary move to Plainmoor, meaning a round trip of 172 miles.
Beleaguered boss Gary Brabin has vowed to fight on, despite facing fresh flak from fans during Saturday's FA Trophy loss to Wrexham.
Supporters at Prenton Park called for the manager's head as their side slipped to a 4-2 derby defeat.
But former Chester player Brabin said: “I’m confident in what I’m doing. I understand the frustration because results need to be better.
“I’m alarmed at the goals we’re conceding. We are working hard to put it right.
“I don’t mind the frustration being aimed at me. But I just ask, can we give the lads a little bit more?"
Rovers have lost eight of their last 12 matches, and are out of both the FA Cup and FA Trophy.
Boss Gary Mills has some selection headaches of the welcome kind for Friday's televised match at Braintree.
The boss made some tactical tweaks for the FA Trophy success at Tranmere, ditching his usual 4-3-3 formation and employing a 4-5-1 system with Sean Newton in midfield and James Gray as a lone striker.
Mills said: "I have now got some decisions to make and a lot of players have asked the question of how am I going to leave them out, but that is my job.
“Unfortunately that is the hardest part of my job, but I have to do it.”
The Braintree game is live on BT Sport.