Having spent the earliest part of his career at local club Gug Boldklub he moved to AaB at the age of 14.
He made his first team league debut for AaB in a 2–0 home loss against Esbjerg fB on 21 August 2010, coming on as a substitute in the 80th minute.
[2] His breakthrough into the AaB starting eleven came in the spring of 2012, where he made 11 appearances and scoring 1 goal.
His good form in the 2012–13 season was rewarded with an extension of his contract,[3] a call-up to the Danish national team and interest from European clubs, including Crystal Palace, Anderlecht and Lille.
On 10 June 2014, it was confirmed by the president of FC Twente, Joop Munsterman, that the club was discussing a transfer of Kusk.