Port Vale have unveiled Sinclair as head of coaching development.
Sinclair will take on the responsibility of bridging the gap between the younger players and first team.
He has been working with John Askey's coaching staff since March 2020, having been invited into the set-up by Dave Kevan.
“I'm delighted to be here. My first impressions are that I love the set up. It's obviously a very family-orientated club, a community club, and I like that because there's a synergy between all the departments," said Sinclair.
“Obviously, I see a key part of my role as bridging the gap between the younger players and the first team. I want to bring them on and help them to feel closer to the first team players so that they understand that if they work hard and show the right attitude the gaffer (John Askey) can take a look at them. I want to give them the confidence to feel that someday they can break through."