The world champion women's quad had hoped for a chance to rebound from their defeat in Lucerne.
But their event in Poland was cancelled due to lack of entries with many countries, including China, choosing to miss the event and concentrate on the Olympics.
Instead they will race against men's quads at Marlow Regatta on the same weekend.
"It's great that we can give them a chance to race against crews of a similar speed in the UK," said Mike Spencer-Jones, honorary secretary of the Marlow Regatta.
"The elite quads category should be a competitive event for with overseas crews also expected to race."
In Poznan, Anna Bebington and Elise Laverick will race in the women's double scull for the second successive regatta, while Sarah Winckless - a bronze medallist in the double in Athens - will move into the eight.
Bebington and Laverick were bronze medallists at last year's World Championships but Bebington is only just returning to full fitness after a virus.
Helen Casey and Hester Goodsell will race in the lightweight women's double scull as coach Robin Williams continues to experiment with his top line-up.
The men's eight crew to race in Poznan will be named closer to the event, with 10 names on the short-list.
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