Derval O'Rourke emerged as a slight doubt for the Olympic Games after a back problem prevented her from competing in the 100m hurdles at the National Championships in Santry.

But the Cork athlete, who suffered the back spasm during the warm up, is hoping that that the issue is just a minor inconvenience and that she will be back in action this weekend.

Speaking on her blog - - O'Rourke wrote: "I was supposed to run the nationals today. Unfortunately I didn't run. I raced in Loughborough yesterday and flew back last night."

O'Rourke continued: "For those of you who know me well you know that I've had a back problem for years (I like to be dramatic and call it my broken back) I have an issue with one of my vertebrae.

"I got home last night and felt stiff and tired after two races on a cold, rainy day in Loughborough.

"When I warmed up today I just wasn't feeling great. I was actually moving pretty fast but was stiff in a few places. This made me a little worried especially as my achilles and groin were both stiff."

O'Rourke was disappointed not to have been able to compete on Sunday but hopes that some physio, scheduled for Monday morning, will clear up the issue.

The athlete's blog continued: "The plan is to take some anti-inflammatories, have a few ice baths and let everything settle. After I saw the physio I was feeling quite sad and upset at not running, I really do like to run nationals.

"It's no major drama and I have a physio check up in the morning. The plan is to race next Saturday."

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