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The former Brazil international joined the club on a one-and-a-half year deal in July, but his departure was confirmed on Monday.
Ronaldinho, 35, struggled to have an impact at Fluminense, failing to score in nine games for the Serie A outfit.
The two-time FIFA World Player of the Year was booed by his own fans during a league game in August.
The termination of his contract was confirmed by Fluminense via their website.
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Ronaldinho's first appearance for the Brazilian club came two months after his stint at Queretaro ended.
A lack of preparation was blamed for his poor performances at his new club.
His future remains unclear, but Ronaldinho " a 97-time Brazil international and 2002 World Cup winner " is sure to be in demand.