Williamson, who has not always been a fans' favourite, responded in just the way his manager had hoped and in doing so, sent out a message to the rest of his team-mates.
Pardew said: "It's important that when players come out of the team, their attitude is spot-on because in the Premier League, it's not always the case.
"Williamson's attitude has been spot-on and therefore when the door was opened and he came in, he took the opportunity.
"You can only do that if you condition yourself well and train well, and Williamson has done that, so that's a feather in his cap."
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