Olympic high jump bronze medallist Robbie Grabarz will miss the Commonwealth Games in Glasgow after being ruled out of the outdoor season by knee surgery.
Grabarz, who will also be unable to defend his European crown this summer, will have an operation next week to fix a long-standing problem.
The 26-year-old, who completed a rapid rise from relative obscurity to take a share of bronze at London 2012, has suffered a recurrence of a tendon problem in his left knee.
"We had to look at the long-term outlook and I need to be operating at 100 per cent, not 90-95 per cent as I have been doing," Grabarz said.
"The knee has been a problem for about a year. I need the surgery now as I don't want to compromise my performances by not sorting this problem out.
"I'm gutted I won't be able to defend my European title and compete at the Commonwealth Games.
"It's totally upsetting as I just want to compete at major championships and challenge for medals. It's a long-term decision with 2015 and 2016 in mind."
Grabarz has found things tough since 2012, when he also won the Diamond Race, managing just eighth place at last year's World Championships and failing to make the final at the World Indoor Championships in March this year.
He has not come close to his personal best of 2.37 metres, the joint British record, since the 2012 campaign. The event has since moved on, with Russian Olympic champion Ivan Ukhov and Ukrainian world champion Bohdan Bondarenko clearing the 2.40m mark.
But h is coach Fuzz Ahmed is confident Grabarz can return to challenge for a medal at the 2016 Olympics in Rio.
He said: "This is a new and difficult challenge for Robbie.
"Robbie's team is going to embrace this journey and draw upon our collective experience to ensure Robbie comes back a better athlete.
"This became a worsening problem and now is the time to act. For a number of seasons we have managed the symptoms, but now we must address the cause in order to be ready for Rio.
"The aim for Robbie when he returns in 2015 is to recapture the 2012 form that made him one of the best high jumpers in the world. He is a rare athlete, one that can go over 2.40m and challenge for Olympic and world titles."