Luckily for Ajax's attacking midfielder, he heads into their Europa League clash having endured a traditional English baptism of fire.
"I went to Chelsea twice when I was 14 and 15," he told the Daily Mail. "I was at Danish club Odense at the time and came across with a friend to Cobham. We played against West Ham youth away and the year after we played Millwall away.
"It was a bit of a shock playing against Millwall. I knew the reputation of English football was tough but my first thoughts when we started were, 'Wow, this is different to Denmark'. They kicked a little more and made crazy tackles but I wasn't injured when I returned to Denmark so I guess I did ok."