The 29-year-old scored two own goals and missed a penalty against Chelsea on Saturday, but responded in style by netting twice in the Potters' 4-1 win over Crystal Palace
The Republic of Ireland international scored two own-goals and missed a penalty as his side lost their first home game in nearly a year on Saturday.
However, after netting twice as Tony Pulis' men bounced back with a 4-1 victory over Crystal Palace in their FA Cup third-round replay, the striker expressed the importance of remaining calm under pressure.
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"In football you have ups and downs, but you have to try and remain level headed at all times - because if you don't then you get affected by things.
"I was confident coming into the [Palace] game, there was never an issue about that.
"What happened on Saturday happened on Saturday and you just have to move on.
"I got a bit of stick from the lads at the weekend, but most of that came from me kicking the ball against my own head (while attempting to take a shot in the first half) before I scored the two own-goals.
"It's nice to get a couple at the right end though."