Allardyce admits they need three points after defeat to Arsenal.
Allardyce said: "West Brom is becoming a must-win, so we have to go all out without being over anxious or over adventurous.
"We can't start leaving backdoors open and start conceding too many goals, we're going to have to score far more goals than we concede to win a game of football.
"Our big games are the West Broms and Fulhams in the next two games.
"It is about performing like that against those clubs, which give you a better chance to win the game."
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