 Originally a half back, Erentz was signed by Newton Heath in June 1892 in preparation for their first season in The Football League.He made his Newton Heath debut on 3 September 1892, playing at left half in a 4–3 defeat by Blackburn Rovers.Erentz was almost an ever-present during the 1892–93 season, missing only an away match against Derby County on 11 February 1893.