Chelsea striker Didier Drogba will miss Saturday's trip to Sunderland, says Andre Villas-Boas, but the Ivorian is doing all he can to be fit in time to face Manchester United next weekend.
Drogba, who was knocked unconscious during Chelsea's last outing against Norwich on August 27, has returned to light training this week, but will also be out of Tuesday's Champions League opener against Bayer Leverkusen.
The 33-year-old is still suffering from concussion after his horrendous clash with Canaries 'keeper John Ruddy, but Villas-Boas says his burly forward is showing good signs of recovery.
"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."
The Chelsea boss added Drogba was given extra time to recover from the collision due to the potential seriousness of the head knock.
"The first days were, of course, tremendous pain, and he had his family supporting him," explained Villas-Boas.
"He had complete support from the medical staff, who were with him 24-seven.
"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."