Pieters scored his first goal for Stoke in their 1-0 win over Newcastle United on Saturday, the club's fourth win in five matches.
The 25-year-old has 17 senior international caps for Netherlands to his name, although he has not featured for his country since a 2-0 friendly win over China last June.
He knows a call-up to Louis van Gaal's 23-man squad for the World Cup is unlikely, but is still keeping his fingers crossed.
"Of course I have one eye on the World Cup, but that might just be to watch it on the 'telly' I think," Pieters told The Stoke Sentinel.
"We've got four matches to go. I will give everything in these last four games and see if I will either go on holiday or to the World Cup."
"Everyone knows he's (Krul) my best friend in football, so it was really good to score my first goal – and a great goal as well – against him," Pieters added.
"We're still friends, I think. He looked a bit disappointed. Now I want five goals before the end of the season.
"I like to attack but the main thing is to defend, to keep clean sheets and I want to keep doing that over the next four games."
