The 18-year-old has joined the Blues following a successful trial at the club.
Traore has signed a four-and-a-half year contract with Chelsea.
The youngster has 10 international caps for Burkina Faso and is expected to feature in next month’s World Cup qualification play-off against Algeria.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?