The then 17-year-old from Burkina Faso caught the eye with a number of impressive performances for the club - including a man-of-the-match display against Malaysia XI and a superb goal against Indonesia All-Stars.
His countries lowly FIFA Ranking in the past (they are now in the top 50 after a good year) has made it difficult for him to obtain permission from the Home Office to play football in the UK - despite his exceptional talent.
If Mourinho had his way, they would have signed Traore to a professional contract when he turned 18 last month - but he still did not fill the eligibility criteria.
Until last month - when they finally managed to tie the 18-year-old talent down to a contract after securing him a Work Permit, with Traore singing on until 2018.
Today his Burkina Faso side travel to Algeria trying to secure a first World Cup qualification - leading 3-2 from the first leg.
And their manager Paul Put has been speaking about Traore today - not holding back with his gushing praise when speaking to ESPN:
“I think it is one of the greatest stories that we have in Burkina Faso. I saw some previews of him when he was playing for the under-17s and also went to Chelsea to see two friendly games because he had no contract and could not play in competition. He is one for the future, but is already one of the greatest players that Burkina Faso has. I think in the future he has the potential to play regularly for Chelsea. He has something that I haven’t seen in a lot of players, he has something special.”
High praise from his national team boss - and now Traore will hope to help his nation qualify for Brazil next summer, and start to make his way into the Chelsea XI.
image: © Jason Bagley