Meanwhile, the European Tour says the Irish Open remains hugely important.
European Tour chief Keith Pelley insists that this year's Ryder Cup is "still on the schedule".
Padraig Harrington's European team will defend their trophy against America in Wisconsin in September.
Brooks Koepka, Jon Rahm and Rory McIlroy are among the players who have suggested it should be moved to 2021 to allow supporters to attend.
Meanwhile, the European Tour says the Irish Open remains hugely important, despite no date for it being allocated on the latest calendar.
The Tour will get going again with six UK events from the end of July.
The PGA Championship is to take place at Wentworth in October, leaving September as a potential window for our national championship at Mount Juliet.
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