Chelsea have confirmed that goalkeeper Petr Cech could be out for as long as a month due to a calf injury sustained in the Champions League defeat by Internazionale on Wednesday evening.
The 27-year-old Czech Republic international had to be replaced just past the hour mark in the San Siro and has now been ruled out for at least three weeks.
A short statement on the Blues' official website read: "Chelsea Football Club can confirm scans show Petr Cech suffered a tear in a calf muscle during the second half against Inter and he is expected to be out for three to four weeks."
Cech's team-mate Frank Lampard had earlier admitted that the loss of the world-class gloveman would be a major blow.
He commented: "It is a huge blow to lose Petr.
"He has been in fantastic form as everyone knows and he has always been up there with the best in the world and no-one wants to lose that.
"But Hilario has never let us down at all. He has been brilliant every time he has come in whether it is for one game or a run of them.
"That is something we are not worried about. Obviously losing Petr is a big blow, but Hilario always comes in and does very well."