Mourinho faces defensive concerns

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Jose Mourinho says the absence of captain John Terry and keeper Petr Cech has left Chelsea vulnerable in defence.

Terry, who may need back surgery, has missed the last three league games - in which Chelsea conceded six goals - and Cech fractured his skull in October.

"We sold William Gallas and Robert Huth in the summer. We don't have enough cover so at this moment in time we are having problems," said boss Mourinho.

"Normally for Chelsea three consecutive matches would mean three clean sheets."

<a onClick="javascript:launchAVConsoleStory('6210637'); return false;" href="http://news.bbc.co.uk/sport1/hi/video_and_audio/help_guide/4304501.stm">Interview: Chelsea boss Jose Mourinho</a>

To lose Petr and John at the same time is a very difficult problem to solve, especially in a squad without more central defenders Chelsea boss Jose Mourinho

Terry missed Chelsea's 3-2 wins at both Everton and Wigan and the 2-2 with Reading on Boxing Day.

He was also sidelined for the Carling Cup victory lover Newcastle.

Mourinho paired Ricardo Carvalho alongside right-back Paulo Ferreira in the centre of defence against Reading.

"For us to win matches right now we need to score three times. Sometimes we'll do it, sometimes we won't," added Mourinho.

606: DEBATE <a class="" href="http://www.bbc.co.uk/dna/606/A18421346">I am expecting us to buy a defender in the transfer window as JT's back problem seems serious but who do we buy? </a> JH <a class="" href="http://news.bbc.co.uk/sport2/hi/606/default.stm">606: Have your say</a>

"To lose Petr and John at the same time is a very difficult problem to solve, especially in a squad without more central defenders."

In September, German defender Huth moved from Stamford Bridge to Middlesbrough and Gallas joined Arsenal .

Chelsea's first-choice keeper Cech was injured in a collision with Reading's Stephen Hunt in October.