Wloszczowska, who won a silver medal at the 2008 Olympic Games in Beijing, crashed in training last weekend and injured her foot. She will be out of competition for approximately six weeks, missing the London Olympic Games and Worlds.
Mountain bike team coach Marek Galinski selected Gorycka to race instead in the elite women's cross country race on August 11. Gorycka won the Polish cross country title earlier this month.
Aleksandra Dawidowicz will also race for Poland in what will be her second Olympics; she finished 10th in Beijing.