Fulham boss Chris Coleman has goalkeeper worries with Jaroslav Drobny and Mark Crossley both injured.
Drobny was injured on a pre-season trip to the US and was forced to play with his knee injury when Crossley incurred a knock against an MLS All-Star team.
Drobny, 25, is set to have surgery and miss between three to six weeks while Crossley's problem is not as serious.
"I will learn the precise diagnosis after the surgery," Drobny told the Czech Daily Post.
He added: "I will be out at least three weeks, six at the most. It is a great pity as it looked like I could be involved at the start of the season.
"But I cannot do anything else, I must recover as soon as possible and fight for the number one shirt again."
Of the decision to go on in place of Crossley when he was already carrying the injury, Drobny joked: "What else could I have done? I went in and kept standing on one leg."
Drobny added: "Fulham will start looking for a goalkeeper, but I think it will be someone on loan."