Russia captain Roman Shirokov will miss the World Cup due to a knee injury and will be replaced in the squad by Pavel Mogilevets.
Shirokov, who has been on loan at FC Krasnodar from Zenit St Petersburg, has been sidelined since April after damaging knee ligaments against Lokomotiv Moscow.
He sat out the recent friendlies against Slovakia and Norway, and was forced to miss Friday's win over Morocco after suffering a relapse in training.
The 32-year-old is now due to have surgery on the knee injury next week, prompting Russia coach Fabio Capello to call up Rubin Kazan midfielder Mogilevets as a replacement.
"On Monday, Shirokov will fly to Finland to undergo knee surgery there," Capello told reporters.
"Shirokov is a very important member of Russia's squad but I hope that the rest of the players will be able to perform at their best level in Brazil anyway.
"I am one of those people who believes that the glass is always half full.
"Mogilevets will replace Shirokov in our squad but we still have time before June 15 to make final changes in the squad's line-up."
Russia fly out to Brazil on Saturday and open their World Cup campaign against South Korea on June 17 before also facing Belgium and Algeria in Group H.