Koopmeiners is a Dutch professional footballer who currently plays as a defensive midfielder for Fiorentina in Serie A. He was born on February 12, 1985, in Amsterdam, Netherlands.

In the 2007-08 season, Koopmeiners made his debut for Ajax and quickly established himself as one of their top players. He then moved to PSV Eindhoven in 2009 and helped them win the Eredivisie title in 2011.

Koopmeiners joined Juventus in 2014 and immediately became a key player for the club. He played in all but two of Juventus' league games that year and helped them win the Serie A title. In the following seasons, he continued to be a vital member of the team, contributing to several important victories.

One of Koopmeiners' most notable moments came during the 2016-17 season when he scored the winning goal against Inter Milan in the final of the Coppa Italia. This was a crucial moment for him, as it showcased his ability to score goals from midfield and contributed to Juventus's success that season.

Koopmeiners has also been recognized for his performances with numerous awards, including the Golden Ball award for best midfield player in Serie A in 2016-17.

Overall, Koopmeiners' significant playing time at Juventus has been a highlight of his Italian Premier League career. His contributions to the team have not only helped them achieve success on the pitch but also earned him recognition as one of the top players in European football.

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