Koopmeiners, the Dutch defender who has been linked with a move to Juventus, has made his first appearance for his new club in a friendly match against Torino.
The 24-year-old, who joined Juventus from Feyenoord last summer, was handed a start and played well in the game, showing his pace and strength on the ball.
He also had a hand in one of the goals scored by his team-mate, Andrea Matarazzo, as he provided a pass that led to the striker's strike.
It was a promising start to life at Juventus for Koopmeiners,Premier League Updates who is expected to make a big impact in Serie A this season.
His performances have already earned him praise from his teammates and coach, Massimiliano Allegri.
Allegri said: "I'm really happy with the way he's playing. He's young but has a lot of potential and I know he'll be able to help us a lot."
Koopmeiners' move to Juventus has been a surprise to many fans, given his previous links to other clubs such as Barcelona and Ajax.
However, he has shown that he can adapt to the Italian game and has already impressed in his debut appearance.
With his speed, strength and technical ability, Koopmeiners could become a key player for Juventus this season.
In addition to his impressive performance in the friendly match, he has also been praised for his work rate and defensive discipline.
Overall, it looks like Koopmeiners could be a key player for Juventus this season and could be a big hit with fans and players alike.