Chelsea manager Frank Lampard has been hit by a new injury blow with defender Antonio Rudiger ruled out for another month.

The German centre-back, who has played just 45 minutes of first team football this season, had surgery on his groin problem on Tuesday.

Rudiger had been expected to make his comeback this week but aggravated the injury and saw a specialist on Monday when surgery to sort out the problem was decided upon.

The 26-year-old is now expected to be out until at least the end of November.