"The lacklustre trading environment in Europe and the unfavourable development of several currencies versus the euro indicate that the group's goals for the full year will be more challenging to reach than when initially announced," the company said.
The German group that competes against Nike and Puma said it was slightly revising downwards its projected full-year sales "to grow at a low to mid-single-digit rate on a currency-neutral basis".
Sales in the second quarter fell four per cent to USD 4.5 billion, while net profit jumped four per cent to 172 million euros, said the company which is set to provide the official football at next year's World Cup in Brazil.