Kalidou Koulibaly was not spotted at an open Chelsea training session ahead of the Blues' Champions League quarter-final second-leg showdown with Real Madrid on Tuesday.
The Blues held a session on Monday morning at Cobham where the whole squad was present apart from Koulibaly. The 31-year-old defender limped off in Chelsea's defeat with a hamstring problem at the Santiago Bernabeu last week after sprinting back to recover a loose ball.
"He won't be available for either game [Brighton or Real Madrid]," Lampard said on Koulibaly last week. "A hamstring injury, it will be a matter of weeks rather than days."
