Swansea winger Nathan Dyer is set to be out of action for two months following an upcoming ankle operation, it was announced Thursday.

Dyer will undergo surgery on Monday to remove extra bone growth in his ankle.

"I am bitterly disappointed," Dyer, who recently signed a new four-year contract, told Swansea's 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.

"I saw a specialist last week and the MRI scan revealed the extra bone growth at the back of my ankle.

"There is not a lot I can do about it, but I am determined to work even harder after my operation to play my part for the team on my return."

The 28-year-old Dyer has made over 260 appearances for Swansea since joining from Premier League rivals Southampton.

Last season saw him win a Premier League winner's medal while on loan at Leicester City.