Career
Kastrati scored two goals in 2011-2012 Union of European Football Associations Champions League qualifying match against Bangor City. In 2011 season he also scored 20 goals in 13 matches in Kakkonen for Klubi-04. After that, he went on loan to Football Club Haka to make his Veikkausliiga debut.
On 5 April 2012, he was loaned back to Haka, on a season-long loan.
Kastrati was chosen to the Veikkausliiga team of the Month for May 2013 while playing in Football Club Honka. Kastrati scored his Finland national under-21 team debut goal when Finland beat Wales national under-21 team 5-1 in 2015 Union of European Football Associations European Under-21 Football Championship qualification 14th of August 2013.