Jose Mourinho rejected to opportunity to sign Ronaldinho in his first year as Chelsea boss - preferring to snap up Didier Drogba instead.
According to the Daily Mail, Chelsea owner Roman Abramovich approached Mourinho over a potential deal to bring the Brazilian ace to Stamford Bridge.
But the Special One told Abramovich that he had no interest in bringing the Barcelona playmaker to Chelsea, and instead wanted to sign Ivorian international Drogba.
It worked out well for all parties concerned. Mourinho signed Drogba for £24m from Marseille, and they won two Premier League titles, an FA Cup and a League Cup together.
Ronaldinho stayed at Barcelona until 2008, when he moved to AC Milan. He won two La Liga titles, a Champions League and was named the winner of the Ballon d'Or award in 2005.
When Mourinho first took over at Stamford Bridge in the summer of 2004, he set about overhauling the squad.
Uninhabited by Financial Fair Play rules, Mourinho was able to spend as he pleased to bring the Chelsea squad up to speed with perennial title contenders Arsenal and Manchester United.
He signed Drogba from Marseille, Tiago from Benfica, Ricardo Carvalho from Porto and Mateja Kezman from PSV Eindhoven.
And he let Jesper Gronkjaer and Mikael Forssell leave for Birmingham and Scott Parker to Newcastle.
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