The British Olympic Association has asked triple jumper Phillips Idowu for details on a hip injury that kept him away from a training camp.
The 33-year-old, who is due to compete at the Olympics on 7th August, 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 on 1st June.
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.”