Katarina Johnson-Thompson out of Glasgow 2014 with foot injury

Katarina Johnson-Thompson set a long-jump personal best of 6.92m in Glasgow earlier this month

England's Katarina Johnson-Thompson will miss the 2014 Commonwealth Games in Glasgow because of a foot injury.

The 21-year-old was told to withdraw on medical advice after being diagnosed with a "stress reaction".

She said: "The Commonwealths was a key target for me this year. I was feeling so good in my preparation up until this week so this is a real blow."

Johnson-Thompson posted the highest heptathlon score of the year with a personal-best 6,682 points last month.

Her performance at the prestigious Hypo-Meeting in Gotzis made her one of the favourites to win gold in Glasgow.

The Liverpudlian said: "All the advice is telling me that I risk long-term damage if I compete in a heptathlon in just over a week's time, and I have to take that advice for the sake of my career."

Johnson-Thompson had been competing in the long jump, one of the seven heptathlon disciplines, in the run-up to the Commonwealth Games, which open on Wednesday.

She won silver at the World Indoor Championships in March and set a personal best of 6.92m at the Glasgow Diamond League meeting earlier this month.

"I really hope to be able to compete in the long jump at the European Championships next month, but it doesn't take away how gutted I am that I won't be at the Commonwealths," Johnson-Thompson said.

With Olympic champion Jessica Ennis-Hill absent after giving birth and Morgan Lake, 17, focusing on the World Junior Championships, Grace Clements and Jessica Taylor will represent England.

Ennis-Hill sent a message to Johnson-Thompson after news broke about her withdrawal. "So sorry to hear about your injury," she said. "I know exactly how you must be feeling. But have no doubt you will be back even stronger! This injury is just part of your journey & I know you've got such an exciting future! Xx"

Commonwealth champion Louise Hazel came out of retirement in an attempt to defend her title but, after a flare-up of ulcerative colitis in June, will work for BBC Radio 5 live at the Games instead.

The 28-year-old shared a room with Johnson-Thompson during the 2012 Olympics and suggested her compatriot's recent exertions in the long jump may have contributed to her injury.

"I just question whether that was perhaps a little bit much for her ahead of the championships," Hazel said.