At the age of only 16, 3 months and 9 days, Thychosen became the youngest debutant ever for Vejle BK, when he replaced Nicolaj Agger in the 82nd minute, in the 2-0 victory against Hvidovre IF on 6 October 2013 [REF].
On 25 August 2014, FC Midtjylland signed Thychosen for their U19 squad on a 3-year contract [REF].