The 25-year-old was one of six goalkeepers named in Louis van Gaal's original party for a friendly with France on Wednesday before being cut in favour of Jasper Cillessen and Jeroen Zoet.
Despite the setback, Krul claims that a ticket to Brazil is not out of the question - provided that he can put in some impressive performances for the Magpies between now and the end of the season.
|13/5||France are 13/5 with PaddyPower to beat Netherlands to nil|
"I'm going to do my best to show him that I should be on that plane to Brazil.
"He hasn't phoned to explain his decision but I don't think the manager has to do that."
After going four games without a win, Newcastle have picked up maximum points from their last two games courtesy of victories over Aston Villa and Hull City.
"We had a bad month and I think we have to be honest about that," Krul continued.
"We have turned it around with two great wins and the only thing I can do now is impress in the next 10 games."