Ulster Grand Prix chief Noel Johnston has expressed his disappointment over the news that Ian Hutchinson will miss the remainder of the road racing season.
Swan Yamaha star Hutchinson, who made his return to the Isle of Man TT for the first time since his famous five wins in 2010 last month, has developed an infection in his damaged left leg.
The Yorkshire rider is due to undergo a bone graft and will take some time out this year before returning to action in 2013.
Johnston had been hoping Hutchinson would be fit to return to the Ulster Grand Prix at Dundrod, but said he full understands Hutchy's predicament.
“I was talking to Ian after the Isle of Man TT and it was touch and go whether or not he would make it to the Ulster Grand Prix, but I fully understand his decision to rest up and we wish him all the best,” said Johnston.
“It's disappointing for the fans, but hopefully Hutchy will return after the winter fully fit.
“We still have a superb line-up at Dundrod next month and we're expecting some top class racing at the world's fastest road race.”
Swan Yamaha team boss Shaun Muir has vowed to support Hutchinson through his latest setback.
“It's a huge disappointment for Ian and the team but we have to make sure he is medically well and we will support him all the way through this setback.
“Ian needs to rest up as much as he can and come back stronger in 2013,” he said.
“He showed a lion's heart and massive determination at the TT.
“We had big hopes for the Ulster Grand Prix but it is not to be.
“The important thing now is that he gets the absolute best treatment possible over the coming months and we can have a productive and successful season next year.”
The line-up at the Ulster GP, due to take place on August 11, includes Michael and William Dunlop, current lap record holder Bruce Anstey, Ryan Farquhar, plus the Tyco Suzuki team of Guy Martin and Conor Cummins.