Cech was carried off on a stretcher in the second half after damaging his calf when collecting a cross.
The Czech Republic international underwent further scans on the injury today and the club have now confirmed that Cech will be out for up to a month.
Lay off: Cech will be out of action for a month
It means he will miss Saturday's clash with Manchester City at Stamford Bridge and the return leg against Inter Milan on March 16.
A spokesman for Chelsea said: 'Today's scans confirm that Petr Cech suffered a tear in a calf muscle in the Inter game. He is expected to be out for three to four weeks.'
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