Youth career. Olsen started his career at local club, ASGI from Alsønderup, outside of Hillerød, but later joined the FC Nordsjælland at the age of 12.. Club career Nordsjælland. Already at the age of 17, Olsen was called up by the coach of the Danish national under-21 football team, to replace an injured Kasper Junker in June 2017. He then got his debut for the U21 national team in a game …
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