Having come through the youth setups of Middelfart G&BK and Odense Boldklub before joining Ajax in 2008, Eriksen made his first senior appearance in football in 2010 after he was promoted to the Dutch outfit’s first-team.
His maiden goal in professional football came in that year’s Dutch Cup, getting on the scoresheet in a 6-0 win over Go Ahead Eagles. Ajax went on to win the competition, bringing Eriksen his first taste of silverware, with his contribution to the title also including playing in the second leg of the final – which ended in a 6-1 aggregate victory over Feyenoord.
In March 2010, he made his senior international debut against Austria, having already played for Denmark at several age groups, and in being selected for the World Cup in South Africa, he was the youngest player at the tournament.
The following year he helped Ajax to a first Dutch league title in seven years and individually picked up both the Ajax Talent of the Year and Johan Cruyff Trophy. It would be the first of three successive Eredivisie titles for Eriksen before departing for Tottenham Hotspur in August 2013.