Barkley, who had been with boyhood-club Everton since the age of 11, made a total of 179 appearances for the Toffees, scoring 27 goals in the process.
Barkley was close to joining Chelsea in the summer but pulled out at the last minute after deciding to first recover from his long-term injury and then decide upon his future.
Ross Barkley has signed for Chelsea from Everton, the Premier League champions have announced.
'I think the club decided on this investment also for his contract.
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"I'm overwhelmed. I'm looking forward to it and I'm really excited to get started", he told Chelsea's website.
Understandably, the 24-year-old wanted more time to consider his options, especially seeing as he would not have been fit to feature for his new club until the turn of the year.
Barkley scored five goals and recorded eight assists in the Premier League last season as Everton finished seventh in the table.
The same report claimed that Tottenham Hotspur ended their interest in Barkley due to the player's wage demands, putting Chelsea in the front seat for his signature.
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A move to Chelsea on transfer deadline day in August did not materialise, but Barkley has now moved to Stamford Bridge for a cut-price fee, reported to be in the region of £15million.
Conte had expressed his opinion to the Chelsea hierarchy and left them to do the negotiationsm but has been a big fan of Barkley for a long time.
Blues chief Conte said: "We are talking about an English player, a young player, with good prospects for Chelsea". He's very strong physically, good technique. We have to hope to recover him very quickly & have him for the rest of the season'. Barkley is in the final six-months of his contract at Everton and will thus leave on the cheap with Everton deciding to cash in rather than losing the player in the summer for nothing.
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