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: Liverpool sealed the signing of Roberto Firmino on Wednesday for £29million - seeing the Hoffenheim frontman become the fourth most expensive Brazilian in Premier League history. From Manchester City landing Robinho to Willian arriving at Chelsea, some Samba stars have proved more of a success than others in England's top-flight. Here, Sportsmail runs through the ten most expensive Brazilians to have moved to the Premier League. Robinho arrived in England to much fanfare as Manchester City pulled off a real coup in landing the Real Madrid star for £32.5million on the same day the club was taken over in September 2008.Roberto Firmino has joined Liverpool for £29million from HoffenheimFirmino is the fourth most expensive Brazilian in Premier League historyRobinho tops the list after signing for Man City for £32.5m in 2008Oscar, Manchester United flop Anderson and Jo also feature in the top tenREAD: Firmino has the X Factor Liverpool are looking forLiverpool starting XI next season: Firmino in and Raheem Sterling out 
 Question:Willian joined _ during the 2013 January transfer window and has become one of the Blues most important players.

Chelsea