Paulo Sergio, 44, is Cluj's 12th coach since 2004 and the second Portuguese to take the reins this year after Jorge Costa left the club in April.
He has had spells at Vitoria Guimaraes and Sporting Lisbon and joins Cluj, who have won three league titles since 2008, after leading Hearts to the Scottish Cup in May.
"I am a modest guy," Paulo Sergio told a news conference. "I like to be discreet and work. Success comes after work."
"Ranking doesn't look good, but we don't have to think about rankings now," said Paulo Sergio.
"Nobody wants to win more than me and I know that step by step we can achieve our goals."
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