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West Brom beat Chelsea 5-2 at Stamford Bridge on Saturday afternoon with Thiago Silva sent off in the 29th minute.
West Brom boss Sam Allardyce insists the referee was wrong to give Silva a yellow card for an earlier foul on Pereira in the 5th minute.
According to Allardyce, the Brazilian defender should have been sent off earlier.
Allardyce said: “I think Silva was lucky to stay on when he pulled Pereira back with both of his hands, going through maybe we would have scored a goal.”