The 33-year-old Olympic silver medallist (pictured) and former world champion triple jumper, who is due to compete at the Olympics on August 7, did not travel to the Team GB camp in Portugal.

BOA chief medical officer Dr Ian McCurdie has written to Idowu asking for his medical records.

Gold medal hope Idowu has competed only three times in 2012 and recently pulled out of the London Grand Prix.

The triple jumper, an Olympic silver medallist in Beijing four years ago, last competed in Oregon in early June.

The 2009 world champion has struggled to hit top form, registering leaps of 16.43 metres and 17.05m, well short of his personal best of 17.81m.

He is ranked 10th in this season's global rankings.

BOA spokesman Darryl Seibel said: "Our chief medical officer Dr Ian McCurdie wrote to Phillips and his agent yesterday asking that he provide the relevant medical records relating to his injury and the treatment he is currently receiving.

"Those should be provided to our chief medical officer on a confidential basis.

"The basis for doing this is a clause in our team members' agreement that says athletes are required to provide details of any injury or illness that may impact on their performance during the Games."

Team GB Chef de Mission Andy Hunt told BBC News: "The situation is he hasn't gone to the preparation camp in Portugal.

"Our chief medical officer has written to him and after we have heard back we can make a decision.

Idowu celebrates after winning silver in Daegu 2011

"Let's understand the nature of the injury first.

"There's no decision to be taken yet."

Idowu's coach Aston Moore said yesterday that the athlete had decided to stay in London for treatment from a private physiotherapist rather than travel to Portugal.

Moore said: "In training recently Phillips has had an ongoing injury problem and we have not been able to go at things 100 per cent."

Idowu took three jumps on his last outing in Oregon before sitting out the rest of the competition, telling BBC Sport that he withdrew as a precaution due to wet conditions.

After that, he withdrew from meetings in Oslo and Paris and the Olympic trials in Birmingham, with UK Athletics head coach Charles van Commenee declining to clarify Idowu's situation due to issues of "medical confidentiality".

Idowu claimed before the London Grand Prix that he had never mentioned an injury and was happy to let the "rumour mill stir itself", but pulled out of the competition at Crystal Palace with a hip problem he felt while warming up.

He later wrote on Twitter: "Hey guys, sorry to have to pull out of #ALGP (Aviva London Grand Prix), slight bit of muscle tightness.

"I will be fine in a day or two.

"Hope the other jumpers put on a great show for you.

"See you 7 August.

"Thanks for your support."

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