The midfielder has been linked with Manchester United and Juventus.
At his Europa League media conference, Gasperini said: He (Koopmeiners) is playing with Atalanta and is also playing very well.
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"Atalanta are in three competitions, we hope to be in everything in the next month too.
It is clear that in this period of the season, there may be clubs less involved in the cups and therefore these rumours are fuelled because other teams have little to do and maybe they wonder if it's right that Atalanta are in the cup quarter-finals, so these things come out."