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West Brom beat Chelsea 5-2 at Stamford Bridge on Saturday afternoon, as the Baggies came from a goal down to win the game, following the red card to Thiago Silva.
Speaking after the game, Allardyce revealed that he urged his side to target “rash” Chelsea goalkeeper Edouard Mendy, and hinted that it was the key to beating Chelsea.
Speaking to talkSPORT, Big Sam said: “Letting them play out from the back for the goalkeeper would be a mistake.
“That may have been a tactic we used later in the game but if it works try and keep doing it for as long as possible. That’s why we played two split up front with Mateus Pereira and Mbaye Diagne.
“The press worked very, very well and there is something with their goalkeeper, who can be rash, he can rush out.”
Allardyce added: “If you saw the first goal we scored, he came dashing to the edge of his box and didn’t get anywhere near.
“We felt every time we went back to the goal and we put him under pressure that gave us good opportunities.
“Obviously you could say the sending off helped, playing against ten men, but you’ve got to beat what’s still a very good side.”