The Holland midfielder has stated he expects to be sold by La Dea this summer.
But Percassi told L'Eco di Bergamo: "The club is solid and does not need to sell: Koopmeiners was not sold to Juve nor anyone else, nor did he ask to be sold."
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Percassi was also asked about season targets.
He added: "I don't choose objectives, our satisfaction will be to reach the end without regrets."