The Paraguay has battled for minutes this season.
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Speaking with TyC Sports, Campos said: "Although Miguel is not happy with the minutes he has in England, he wants to stay and fight for his place at Newcastle.
"The coach (Eddie Howe) always supported him . When he made a request, he asked him not to leave. It must be a tactical or temporary issue."
On the summer attempt from Charlotte FC, Campos said: "They offered around 18 million dollars . We had arranged a contract with them, but the club rejected the proposal from the United States."