Early career Elmer was signed by
English Premier League side
Chelsea in the summer of 2005 from
Grasshoppers. He featured regularly for the Chelsea reserve and youth teams in both the 2005–06 and 2006–07 seasons. Elmer made his first start for Chelsea's first team when coming on from the substitutes bench in a pre-season fixture against A.C. Milan, where he played the remainder of the match. His second appearance was against
Wycombe Wanderers on 13 July 2005.
Chelsea went on to win the game 5–1. He also came on as a substitute to make his third appearance for the club four days later as
Chelsea F.C. beat Portuguese club
Benfica 1–0 in another pre-season fixture. Elmer looked as though he could have a promising future at
Chelsea and signed a new two-year contract in early April 2006.
Aarau On 25 June 2007, Elmer traveled back to Switzerland and signed a two-year contract with
FC Aarau Sion On 18 May 2010, it was made official that Elmer had signed a three-year contract with
FC Sion.
Winterthur In 2012, he joined
FC Winterthur in the
Swiss Challenge League and made 21 appearances.
Toronto FC He signed with Toronto FC on 1 August 2013. He mutually parted ways with Toronto FC the following off-season.
Rapperswil-Jona In July 2015, Elmer returned to Switzerland with
FC Rapperswil-Jona.
Return to FC Stäfa Having completed a distance learning degree in business administration in 2016, and since then worked as a property manager beside his football career, Elmer decided to terminate his contract with
FC Rapperswil-Jona at the end of 2019 and put an end to his professional career to focus on his civil career. He continued playing for his former youth club, FC Stäfa, in the Swiss 3rd division, as a player-assistant coach. == Honours ==