German sportswear company Puma has increased its 2021 sales outlook despite highlighting its supply-chain pressures from a coronavirus lockdown in Vietnam, port congestion and container shortages.

Factories in Vietnam, a big supplier to the footwear industry, have been closed due to Covid-19 outbreaks and factory owners have said they only expect to fully resume operations from the second half of 2022.

Puma chief executive Bjorn Gulden said the company was also having to cope with port congestion and shortages of container ships that are pushing up freight costs, along with a "very difficult market situation" in China.

"We foresee the high demand for our products to continue, but we also see supply constraints continue to be a problem for the rest of the year," Gulden said in a statement.

Third-quarter sales rose a currency-adjusted 20.4% to €1.9 billion while operating profit jumped to €229m, both well ahead of average analyst forecasts.

Rival Nike cut its fiscal 2022 sales expectations last month and said it expected delays during the holiday shopping season, blaming a supply chain crunch.

Puma sales jumped 31% in the Americas and 22% in Europe, Middle East and Africa. But they only rose 1.7% in Asia/Pacific due to ongoing tensions in China and Covid-19 lockdowns in markets like Japan.

Western brands, including Puma, faced online attacks in China in late March over past statements saying they would not source cotton from Xinjiang after reports of human rights abuses against Uyghur Muslims.

Beijing denies any such abuses.

Puma said it now expects full-year currency-adjusted sales to rise at least 25%, up from a previous outlook for at least 20%, while it now sees operating profit between €450-500m, compared to a previous €400-500m.