In 1965 Auld returned to Celtic in a £12,000 deal, possibly on the initiative of Jock Stein, who had not yet been appointed Celtic manager. No longer considered a winger, Auld formed a midfield partnership with Bobby Murdoch. He became an integral part of the side that won nine League titles, as well as the 1967 European Cup Final. Prior to that match, against Italian giants Internazionale, Auld instigated a rendition of The Celtic Song in the tunnel, much to the bemusement of the Inter players. Auld left Celtic again in 1971 this time joining Hibernian on a free transfer. While at Easter Road he combined his playing role with one as a trainer, eventually focusing solely on the latter role.