German sportswear company Puma expects a consumer backlash against Western brands in China and congestion at ports to hit its sales though it gave an upbeat outlook for 2021 following a strong first quarter.

Brands including Puma and rivals Nike and Adidas faced online attacks in China last month over statements about their sourcing of cotton from Xinjiang after reports of human rights abuses against Uyghur Muslims.

“We can still see that trend is continuing. There is less activity in the Western brand stores than there would have been if tension wasn’t there,” Puma Chief Executive Bjorn Gulden told reporters.

Before the backlash, Puma’s sales in greater China had been growing strongly, rising 40 percent in the first quarter.

Western governments and rights groups have accused authorities in the western region of Xinjiang of detaining and torturing Uyghurs in camps. Beijing denies the accusations.

Puma has previously said it has no direct or indirect business relationship with any manufacturer in Xinjiang.

Overall, Puma reported a 26 percent rise in first-quarter sales to €1.549 billion ($1.9 billion) after adjustments for currency fluctuations, while net profit jumped to €109 million, both beating average analyst estimates.

Puma’s shares, up two-thirds in the last year, were down 2.9 percent at 09.40 am GMT.

It expects full-year sales to increase by a “mid-teens” percentage and significantly better profitability than last year.

Puma is benefiting from people doing more sport as they try to lose weight after coronavirus lockdowns, a trend it hopes will get another boost after the Tokyo Olympics and the European soccer championships, Gulden said.

However, Puma faces problems getting products made in Asia to key markets due to container shortages and port congestion, especially in North America, following Covid-19 outbreaks among dockworkers and safety restrictions.

While the situation has improved somewhat in the last month or so, Gulden said Puma was still seeing delays of two to three weeks on many shipments, while the cost of freight had doubled and prices were locked in for the next 12 months.

Nike last month reported quarterly sales below estimates due to shipping issues and the pandemic-related slump at stores, forecasting “low-to-mid-teens” full-year revenue growth.

Puma said the pandemic would continue to weigh on its business throughout 2021 with about 30 percent of stores selling its products in Europe and Latin America still closed and new restrictions expected in India, Canada and Turkey.

By Emma Thomasson; editors: Maria Sheahan, Louise Heavens and David Clarke.