"We were in negotiations with him and the agent last week," he told Studio Voetbal.
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Brands further says that he is keen to sign the 23-year-old USA international in a permanent transfer.
"We have to wait and see what happens, but we believe in Sergino and I think he will be healthy again soon. We would very much like to keep him," he added.
Dest's buyout clause is set at 10m.