Didier Drogba is facing a race against time to be fit for Chelsea's Premier League game at Manchester United, as he continues his recovery from a sickening head injury.
Blues boss Andre Villas-Boas has revealed the striker will miss Saturday's trip to Sunderland and Tuesday's UEFA Champions League opener against Bayer Leverkusen.
Drogba is still suffering from the concussion he sustained in the 3-1 victory over Norwich 11 days ago and Villas-Boas claimed the club would 'push it to the limit' to ensure he was available for the trip to Old Trafford on 18th September.
"He has to be authorised medically to make his full return to training," Villas-Boas said. "He has been doing light sessions, of course, with our physios.
"Let's push it to the limit to try for him to be available for Man United. I wouldn't say he would be available for Leverkusen."
Villas-Boas added: "The first days were, of course, tremendous pain, and he had his family supporting him.
"He had complete support from the medical staff, who were with him 24-7. And we've been getting this support to him.
"We just have to make sure that he's fully recovered before he comes back to training because that's the requirement you have to do neurologically."
There was otherwise good news on the injury front for Villas-Boas, who confirmed goalkeeper Petr Cech is available against Sunderland after making a quicker-than-expected recovery from his knee injury.
Defender David Luiz is also back after missing the start of the season with a thigh problem.