When asked whether he thought that awarding the tournament to Qatar was a mistake, Blatter didn't hesitate to express his denial.
"No," he told The Associated Press in Buenos Aires, where he is attending meetings of the International Olympic Committee. "This is a topic that I will present after the meeting of FIFA's executive board in October. We will discuss all of this."
FIFA's 27-member executive committee, including eight UEFA officials, should decide on Oct. 3-4 that the tournament cannot be played in Qatar's searing summer heat. Blatter told the AP last month that his board would probably oppose summer on principle and request a widespread consultation on finding a better time to play.
A November-December tournament would shut down European clubs and leagues for several weeks and alter the Champions League schedule.
"We have a fantastic running season now," Rummenigge cautioned in a later interview with The AP. "It is affecting our business. We have to be very careful now if FIFA would like to move from summer to November or January or, I don't know, autumn or whatever in the end will be the outcome."
Rummenigge said he had no preference on which months to play, nor did he believe FIFA had pre-judged the consultation it will conduct.
"That is a decision we will have to find together," he said, adding that "I don't understand why FIFA would like to do an early decision" nine years before kickoff.
Despite the uncertainty, the former West Germany great does not believe it was a mistake for FIFA to have chosen Qatar in December 2010, when Blatter's board defied advice that hot temperatures could threaten players' and fans' health.
"I played the 1986 World Cup in Mexico. The final was played at 12 noon, in 40 degrees (Celsius) at 2,200 meters (altitude)," said Rummenigge, who scored in the Germans' 3-2 loss to Argentina. "Maybe it was not very good for my health but we did it."
Europe's leagues used the ECA meeting to make their own announcement, urging FIFA not to make a "hasty decision" on rescheduling the marquee tournament
"Such an important decision cannot be rushed with artificial deadlines," the EPFL said in a statement, requesting it should be involved in proper consultation.
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AP Sports Writer Tales Azzoni contributed to this report from Buenos Aires, Argentina.