Manchester United striker Wayne Rooney will have a scan on his broken metatarsal today but the results are not expected to be available to England team doctors until Friday.
Rooney is having an MRI scan on his injury and specialists will analyse the result with Manchester United's assistant team doctor Tony Gill before they are passed on to England.
England's team doctor Leif Sward has to inform FIFA by Tuesday if he expects Rooney to recover in time to take part in the World Cup.
FIFA's chief medical officer Dr Jiri Dvorak told PA Sport: "Each team physician has to confirm by May 30 that their players are physically and mentally fit to participate in the World Cup.
"If Wayne Rooney is on the list then that is, in principle, confirmation that it is anticipated he will have recovered in time to participate in the tournament."
Every player has to have a range of medical tests, including heart monitoring, and be signed off by the national team doctor.
FIFA say they view this as a statement of intent that a player will be available to take part in the tournament, although if Rooney broke down again Sven-Goran Eriksson would have until June 9 to replace him in the squad.
Meanwhile, the departure of Manchester United team doctor Mike Stone from Old Trafford after
10 years remains unclear beyond the fact that he had a major bust-up with Sir Alex Ferguson.
Stone has had his employment with United terminated with immediate effect but club officials insist his departure has nothing to do with Rooney's recovery from the injury he suffered at Chelsea last month.