Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Lionel Messi and Ronaldinho, two legendary Barcelona No 10s and close friends, it's a relationship that has flourished ever since the Argentinian walked into the changing room as a talented 16-year-old. The pair played together at the Nou Camp between 2004-08 and developed a special bond, as Messi began the process of becoming the Brazilian's successor. The Argentinian sent Ronaldinho a signed club shirt as a surprise to show his admiration, and gave it to Barca TV when they travelled to Miami to speak to the playmaker on the 10th anniversary of the 3-0 victory over Real Madrid at the Bernabeu.Lionel Messi sent signed Barcelona shirt to former team-mate RonaldinhoThe pair played together between 2004-08 and developed a close bondRonaldinho expressed his delight at the receiving the presentSee the latest news on Barcelona's Lionel Messi 
 Question:_ is currently without a club after leaving Brazilian outfit Fluminense in September and the former Ballon d'Or winner appears to be heading towards retirement.

Ronaldinho