David Beckham faces a fight to be fit for the start of the season after being ruled out for six weeks.
Beckham, who has stepped down as England captain, had scans on his injured knee and ankle on Sunday.
The Real Madrid midfielder limped out of Saturday's World Cup quarter-final against Portugal in the second-half.
The scans showed a tear in his right Achilles tendon and a small 'lesion' in the ligaments of his left knee.
A spokesman for Beckham confirmed the England star will undergo a second scan on the injuries with the Real Madrid club doctors present.
Beckham, 31, said: 'I twisted my knee in the first-half and then I went up for a header in the first five minutes of the second-half and the player landed on my Achilles.'
He had planned to have three weeks' rest before returning to pre-season training with Real but the injuries could change his schedule.
Six weeks means he would not be in action until August 12, just four days before Steve McClaren's first match as England manager.
McClaren starts his reign with a friendly against Greece at Old Trafford on August 16.
He must name a new England captain after Beckham's decision to retire from the role, with Chelsea skipper John Terry the favourite to take over.
Beckham remains determined not to end his international playing career yet.
He has 94 caps and would love to achieve his century and be part of McClaren's plans for Euro 2008.
England's first Euro 2008 qualifier is at home to Andorra on September 2.