With Manchester United and Bayern Munich, the England midfielder says he doesn't want to know about "interest" and will only consider something when an offer is tabled.
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"I'm not really thinking about it or dealing with it much," Wharton told the Athletic.
"If it's something serious, I can consider it, but if it's just interest, I don't want to hear anything about it."
Wharton's deal with Palace runs to 2028.