Swansea winger Nathan Dyer is set to undergo ankle surgery and miss the next two months.
Dyer, who recently signed a new four-year contract, will have an operation on Monday to remove extra bone growth in his ankle.
'I am bitterly disappointed,' Dyer told the official Swansea website.
'I was feeling good after completing pre-season training and being involved in the friendlies and the first three games of the campaign.
'I started to feel some pain in my ankle after returning from the training camp in America.