The 30-year-old is taking a step back from football after announcing he is to donate a kidney to his sister.
As a player he pulled on the shirt more than 200 times for the Tigers and was loved by supporters for his dogged displays in five years in front of them.
Off the field he is determined to win another battle with his sibling suffering from a serious illness.
Gloucester City manager Mike Cook thinks the decision made by the former right back, a key part of his managerial team, speaks volumes for him.
Green won’t be around the National League North club for three months but he signed off in style last Saturday, helping the team to a 2-1 win over Darlington.
Manager Cook has spoken to Gloucester Live about a big moment in his right-hand-man’s life.
“We said after the game on Saturday that the result pales into insignificance when someone does a great and unselfish act like that for his sister,” City manager Cook told them.
“I hope it works well and he recovers okay from it. Some of the fighting spirit the lads have shown in the last few games, that’s what he was renowned for as a player so he will be a miss for us.
“He’s quiet around the place but when he does speak people listen because he’s very experienced and there’s a lot of respect for him in the changing room.
“We’re sorry to see him go but he’s doing a courageous and selfless act and hopefully he will come back fighting fit.”