The mission did not immediately respond to a request for comment.
Voting last weekend was the first time in 15 years that the EU sent a mission to observe Venezuelan elections. The team included 1,000 observers who monitored voting in 22 out of 23 elections and the full report will be presented in two months.
Several mayoral races had yet to be called, and one governor's office - in Barinas state, a Chavismo stronghold - has not been called either.
"The European Union couldn't stain the electoral process, it was impeccable, beautiful," Maduro said.
The President will hold meetings in "the coming hours" with opposition governors, he said, without giving further details.
He also suggested the ruling Socialists could have lost in a few states and municipalities due to voters punishing the party at the polls.
While the ruling party picked up the most governorships, votes for the Socialists dwindled to fewer than 4 million, according to figures from the country's electoral authority, down from the 5.9 million it won during regional elections in 2017.
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