Harry Kewell will miss the start of Liverpool's Premiership campaign with the injury that cut short his World Cup.
It was initially reported that the Australian was suffering from gout in his left foot, but Liverpool have now revealed that he actually has a bacterial infection in the joints known as septic arthritis.
He has had surgery to alleviate the problem and is set to be sidelined for six weeks, meaning that he will miss The Reds' opening UEFA Champions League qualifier and the Community Shield against Chelsea on August 13.
Kewell is not then expected to resume training until one week after the league season starts.
"It is unfortunate that another Australian player spoke publicly about his condition rather than an official spokesperson for the national team," said a Liverpool spokesman, with regard to Scott Chipperfield's original diagnosis of gout.
"His team-mate suggested that Harry had been suffering from gout, which we can confirm was an incorrect diagnosis.
"Following Harry's return to Liverpool and examination by our own medical staff, it became apparent he was suffering from an entirely different condition.
"This was identified as a septic arthritis; a bacterial infection in the joints of his left foot.
"Harry is currently undergoing treatment in hospital following a surgical procedure. He is expected to make a complete recovery and should be able to resume training in approximately six weeks' time."
Kewell could face a battle to regain his Liverpool place following the arrivals of Mark Gonzalez and Fabio Aurelio, but for the moment the 27-year-old is refusing to get drawn into speculation about his Anfield future.
"I have got to see what happens with my fitness in the immediate future, and try to get everything right," said Kewell.
"I am not thinking about anything except getting myself fit."