Paul Merson says Chelsea's model for buying players doesn't allow them to buy a top goalkeeper.

Robert Sanchez was once again under the spotlight as Chelsea lost 2-1 at Man Utd on Saturday Night Football to slip seven points behind champions Liverpool at the top of the Premier League.

The goalkeeper was sent off after just five minutes for chopping down Bryan Mbeumo, making the visitors' task even harder at Old Trafford.

On Super Sunday, Sky Sports ' Jamie Carragher said Chelsea can't win the Premier League with their current goalkeepers and centre-backs , and questioned why they have not improved in those areas with the amount of money they have spent.

Chelsea were interested in AC Milan 'keeper Mike Maignan last summer, but were not willing to match the Serie A club's valuation

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