Career
Football Club Midtjylland
Gemmer got his official debut for FCM on 29 August 2013, in a cup match against Vendsyssel FF, at the age of only 17. Gemmer got his debut in the Danish Superliga on 16 September 2013 where he was in the line up against Football Club Nordsjælland. He had trained with the first team squad throughout the season, while playing for the U19 and reserve squad.
In October 2014, Gemmer was rewarded with a new contract that would expire in 2019.
In January 2015, Gemmer was permanently moved to the first team squad, at the age of 18. Loan to Air Corps Horsens
On 25 January 2016 it was confirmed, that Gemmer was loaned out til the Danish 1st Division-club Air Corps Horsens.
He got shirt number 14.
