By Sarah Holt

Rawlinson will make a last push to prove his fitness

Chris Rawlinson will make a last-gasp attempt to prove his fitness and book his place in Great Britain's squad for next month's World Championships.

Britain's number one 400m hurdler will compete at Friday's Norwich Union London Grand Prix and the Helsinki Grand Prix on Monday.

"I'm going to give it a go at Crystal Palace and I have set myself a target of running sub-49 seconds," he said.

"But if I feel I cannot make the final in Helsinki, there's no point going."

"Chris will compete these two races before making a final decision," his agent James Hunt told BBC Sport.

Rawlinson, 33, had told GB officials he would not be available for selection immediately after racing over 400m flat last weekend.

Elias won the AAAs title and is bidding for a Worlds spot

But he described that as a "spur-of-the-moment decision", which he had reconsidered after performing well in training.

He said his judgement of his performance at Crystal Palace would also be affected by the weather.

Rawlinson has had a difficult season, suffering a virus in April and having a hernia operation in May before picking up a foot injury in June.

"It's been a horrendous time for me and I just haven't had the chance with illness and injuries to prepare properly for this season, and I haven't had enough races.

"I've had an MRI (scan) for the foot injury and that restricted me immensely. All I've been able to do, until a couple of weeks ago, is some cycling and get in the swimming pool to keep myself in condition."

Rawlinson's agent James Hunt told BBC Sport: "Chris is aware he's lost a lot of ground and couldn't put races together.

"He wants to be confident he can do himself justice against the top international athletes."

Rawlinson was expected to be named in the team despite not achieving the qualifying standard this year.

But the Yorkshireman could face tough competition from AAAs champion Matt Elias and rising star Rhys Williams at Crystal Palace.

Williams chasing Worlds qualifying

Williams has the fastest time in Britain this season at 49.60 seconds.

And the 21-year-old Welshman is hoping to reach the qualifying standard of 49.20 on Friday.