Chelsea defender Jose Bosingwa is set to miss the Premier League opener against Portsmouth after being ruled out for three weeks with a thigh injury.
The 25-year-old right-back, who joined Chelsea from FC Porto over the summer, left the Blues' pre-season tour of Asia and Russia on Saturday and returned to London after being diagnosed with a small tear in his upper thigh.
Chelsea begin their Premier League title challenge against Portsmouth at Stamford Bridge on August 17 before an away trip to Wigan six days later.
Chelsea coach Luis Felipe Scolari said: 'He is out for two weeks minimum for treatment and he won't be able to play for three weeks.
'At the moment, he is out of the first game against Portsmouth.'
After completing just 20 minutes of his Chelsea debut against Guangzhou Pharmaceutical in China on Wednesday, Bosingwa underwent a scan in Macau on Friday which revealed the extent of the injury.
But despite the potential loss of his summer recruit, Scolari is confident Paulo Ferreira and the versatile Michael Essien can replace Bosingwa after the pair featured during Saturday's 7-0 win over Chengdu Blades in Macau.
'I have players who can cover,' Scolari added. 'I played with Paulo today, Essien also played there for 30 minutes, and they both played very well so it is not a problem for us.'
Chelsea complete their three-game Asian tour against a Malaysia Select XI in Kuala Lumpur on Tuesday before they travel to Moscow to face Lokomotiv Moscow and AC Milan or Sevilla in the Railway Cup.