Frank Lampard has ruled out Emerson until after the October international break.
The left-back made his return against Liverpool on Sunday after missing two games with injury.
However, he limped off after 15 minutes and Lampard has confirmed he will be out of action until October.
"Emerson now won't be back until the other side of the international break," Lampard told Chelsea's website.
"It will be a few weeks because it is the recurrence of an injury so we have to be a bit careful with it."
