The former Southport man joins the Bucks in time to play in tonight’s game against Brackley Town at the New Bucks Head.
The 22-year-old, who started out at Liverpool’s academy also played for Bolton Wanderers in the Championship under Neil Lennon.
He joined Southport in September last season and was one of the club’s stand-out players before sustaining a serious ankle injury in the Boxing Day clash against Wrexham which kept out for the rest of the season.
Lussey has spent some of pre-season with SkyBet League Two side Coventry City on trial but Buck boss Rob Edwards has managed to secure his signature ahead of tonight’s game.