Allardyce said the 2,000-plus fans who had made the long journey to Lancashire had been rewarded for their outstanding loyalty and passionate support.
"I didn't really tell the players to go out and play they way they played in the first half, but the fans gave me a bit of stick walking off and rightly so because they hadn't seen their players play the way they can," the manager told whufc.com.
"I told them at half-time that our 2,000 fans had paid 80 or 90 quid to get to the game and they were giving them stick so 'What are you doing? You've got a West Ham shirt on and I don't care old or young you are, go out there and give them some entertainment and value for money'.
"I told them 'I'm going to change the system to help you because the current one isn't working, then you go out and play like you can'.
"Systems only work when the individuals play to their best and our individuals did a magnificent job in the second half and gave the fans a lot of entertaining, attacking play at their end. They wanted to see us win and we did."
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