Brentford have put in a €15 million offer for Gremio full-back Vanderson.
According to Goal.com, the Brazilian club are adamant about keeping the defender until the end of the year.
Gremio turned down a loan offer from AC Milan for Vanderson last week, while their present Romildo Bolzan indicated the player was untransferrable.
However, Brentford do have some optimism that if they offer a high enough fee, a deal can be done before the window closes on Tuesday night.
It is possible the two clubs may come to an arrangement that sees Vanderson move to England in January.
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