They are second but have played a game more than leaders Slovakia.
Northern Ireland are away to Poland on 5 September and at home to Slovakia four days later.
The campaign ends with a trip to the Czech Republic on 14 October.
Worthington has named five strikers in all with record scorer David Healy, Kyle Lafferty, Martin Paterson and Andrew Little all included.
The NI boss indicated he would keep faith with Healy despite his lack of first team action with Sunderland.
"If we had a Torres or Defoe, then I could say to him, have a breather. But we are not in that situation," said the former Norwich boss.
"I have got to go with him. Knowing David's passion for his country, he is very frustrated.
"He wants to put things right and what better time than over the course of the next three games."
Maik Taylor looks likely to continue in goal even though he has lost his place to Joe Hart at Birmingham as both Jonny Tuffey and Alan Mannus are inexperienced.
To have any chance of qualifying for the 2010 finals in South Africa, Northern Ireland need to improve a dreadful away record.
Northern Ireland squad
Goalkeepers: Taylor (Birmingham), Mannus (Shamrock Rovers), Tuffey (Partick)
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