Anthony Callaghan has decided to leave South Shields following the expiration of his contract.
The left-back was asked to attend pre-season training by the management with a view to demonstrating his fitness and earning a new deal following his recovery from back surgery, but has opted to look for options elsewhere.
The 25-year-old, who joined from Washington in October 2016, made his 50th and final appearance for the Mariners as a substitute in the Durham Challenge Cup final defeat to Shildon in May.
That was his first appearance since Boxing Day 2017 after he was supported by the club and physio Andrew Morris in his recovery from a serious back injury.
The club say they would like to wish Anthony well for the future and thank him for his service.
Callaghan said: “I’ve thoroughly enjoyed being part of Shields’ incredible journey over the last two-and-a-half years.
“I will always cherish the memories of contributing to the revival of such a great club and being involved in two successive promotion campaigns.
“I’d like to thank the club – not least the medical staff – for supporting me in my recovery from injury.
“It will of course be a big wrench to no longer be involved at Shields, but with my contract ending, I am looking forward to a new challenge and playing regular football at the best level possible now I am fully fit again.
“It goes without saying that I wish Graham, Lee and all the players every success, including promotion this coming season.”