Leur, 24, joins the Sports after departing promoted Woking, where he scored nine goals as the Cards secured promotion to the National League.
Greg may be familiar with some Sports fans, having played for the club's Under 18 side six years ago before he moved to Burgess Hill Town.
It was from there that Luer's career took off, as at the age of 20 he was snapped up by EFL Championship side Hull City in January 2015.
He made his debut for the Tigers on the opening day of the 2015/16 season, before scoring his first goals in the League Cup that season against Accrington Stanley and Rochdale.
However, with opportunities limited he went on loan to Scunthorpe United, Stevenage and then Maidstone United in a bid for more first team football.
Leur left Hull at the end of the 2017/18 season, and joined Woking having had a successful trial.
Boss Lee Bradbury said: "I tried to get Greg last season whilst I was at Havant, so when the opportunity came up to get him on board we jumped on it.
"Greg is a proven goal scorer at this level, having just helped Woking achieve promotion, and I can't wait to work with him.
"I want the fans to be entertained, and signing a player of Greg's ability should add to that factor as we approach the start of the new season."
Welcome to Priory Lane, Greg!