Blatter also took aim at the companies working on the venues.
"The big companies working there, they are all European," Blatter said. "The constructor is also responsible for his workers."
The International Trade Union Confederation set off the growing furor two months ago when it claimed that, without changes, at least 4,000 workers would die due to inhumane labor conditions.
Blatter implied the construction companies' interests played a role in the controversial vote to award the tournament to Qatar.
"It was political pressure from European countries to bring this World Cup to Qatar, because there was so many economic interests," he said. "Two of these countries that made pressure on the voting men in FIFA were France and Germany. This is established. This is not new information.
"It's easy to say all the responsibility lies on FIFA. No, we are part of this responsibility. We are now monitoring the situation and we will come back to it."
Blatter reiterated his desire to hold the '22 tournament at the end of the year, having rejected the traditional June-July World Cup period because of Qatar's searing desert heat.
"We are now consulting the stakeholders teams, players, leagues, federations about the international calendar, also media and marketing, to look if it's possible to play at the end of the year, in November-December," Blatter said. "I think it's advisable to play at the end of the year."
As for next year's World Cup in Brazil, Blatter said there was still a possibility that midday kickoff times at tropical venues could be moved later to avoid intense heat and humidity there.
Blatter said he would bring up the kickoff time questions at next month's FIFA executive committee meeting in Salvador, Brazil.
"(The kickoff times) have been established but not sanctioned," Blatter said. "It's a very important matter."
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Follow Andrew Dampf at http://twitter.com/asdampf
