Career
Everton
Hammar joined Everton from Malmö FF in July 2010, signing a full-time scholarship with the club He was released on 7 June 2013. Stockport County
On 11 February 2013, Hammar joined Stockport County on a one-month loan.
He made his debut on 16 February 2013, in Stockport"s 0-0 draw with Ebbsfleet United.
He made a total of six appearances for the club before returning to Everton. Malmö FF
On 18 June 2013 Hammar signed a six months contract with his youth club Malmö FF. He joined the club on 1 July 2013.
Hammar made his debut for the club in the Scanian derby against Helsingborgs IF away at Olympia on 25 September 2013. On 9 December 2013 Hammar signed a new three-year contract with the club
In his first full season at the club he made seven league appearances for the club and participated in three qualifying matches for the 2014-2015 Union of European Football Associations Champions League.
Hammar has made several appearances for Sweden U19s.