On-loan from Mainz, Mateta is expected to eventually leave Palace for ASSE in the coming days.
Dupraz said, "We want to recruit a striker with characteristics that must match what I intend to offer.
"The more we talk about this player, the less he will come to ASSE. I can just tell you that we have him on the phone a lot.
"It is still inappropriate to say that he will join us."
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