Both the Norwegian news agency NTB and the British PA report that Uefa leaders were still waiting for a response from Fifa on Monday afternoon. The deadline is midnight on Monday, November 2.
Uefa's eight-page letter is dated October 19 and was sent to Fifa general secretary Mattias Grafström, who is Swedish.
Many of the questions concern Fifa president Gianni Infantino's now-scrapped plans to sell shares in the World Cup to private investors.
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