Tadić signed for Dutch club Ajax in June 2018.
Ajax paid a transfer sum of €11.4 million, which could reach €13.7 million based on variables.

On 5 March 2019, Tadić’s goal, two assists and man-of-the-match performance helped knock Real Madrid out of the last 16 of the Champions League, as Ajax unexpectedly won 4–1 at the Santiago Bernabéu Stadium.
The Spanish side had won the previous three Champions League titles and had beaten Ajax 2–1 in the first leg in Amsterdam.
Tadić's performance in the game resulted in him becoming the ninth player ever to receive a 10/10 rating from the French football newspaper, L'Equipe.
The signing of Tadić was seen by some pundits as the single biggest reason for Ajax’s improvement in the 2018–19 season.

On 23 April, Ajax defeated Vitesse in an Eredivisie match by a score of 4–2; the four goals scored by Ajax secured their position as the first Dutch team in history to score 160 goals across all competitions in a single season.
Through 51 games played at the time, Tadić had directly contributed to 53 of the club's goals in all competitions: 34 goals and 19 assists.

Tadić was one of four Ajax players nominated for the 2019 Ballon d'Or, and at the ceremony on 2 December 2019, it was announced that he finished in 20th place.
Tadić signed for Dutch club Ajax in June 2018. Ajax paid a transfer sum of €11.4 million, which could reach €13.7 million based on variables.
On 5 March 2019, Tadić’s goal, two assists and man-of-the-match performance helped knock Real Madrid out of the last 16 of the Champions League, as Ajax unexpectedly won 4–1 at the Santiago Bernabéu Stadium. The Spanish side had won the previous three Champions League titles and had beaten Ajax 2–1 in the first leg in Amsterdam. Tadić's performance in the game resulted in him becoming the ninth player ever to receive a 10/10 rating from the French football newspaper, L'Equipe. The signing of Tadić was seen by some pundits as the single biggest reason for Ajax’s improvement in the 2018–19 season.
On 23 April, Ajax defeated Vitesse in an Eredivisie match by a score of 4–2; the four goals scored by Ajax secured their position as the first Dutch team in history to score 160 goals across all competitions in a single season. Through 51 games played at the time, Tadić had directly contributed to 53 of the club's goals in all competitions: 34 goals and 19 assists.
Tadić was one of four Ajax players nominated for the 2019 Ballon d'Or, and at the ceremony on 2 December 2019, it was announced that he finished in 20th place.
Dušan Tadić