The defender, 24, joined the Cottagers from relegated Swansea in a £15million deal last week.
But having undergone surgery in May, he looks unlikely to be fit until September.
Boss Slavisa Jokanovic said: "He must wait another three weeks, and then he’ll start working with us.
“I don’t think he’ll be available to help us until September.”
It is a blow to Jokanovic whose squad is thin on the ground as it is.
Versatile full-back Maxime Le Marchand started alongside Tim Ream in yesterday’s 2-2 draw with Celta Vigo.
Aleksandar Mitrovic was on target on his return to West London after his £22m switch from Newcastle.
Fulham have looked shaky at the back in pre-season, conceding ten goals in their last four friendlies.
Jokanovic will lead his side at home against Crystal Palace on Saturday in their opening game of the campaign.
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