The Ghana international, who signed for the Blues in September 2013, operates as a winger, although he can also play as an attacking midfielder.
Since joining the Premier League champions, Atsu has gained experience out on loan with Everton and Vitesse.
Collecting almost 40 caps for his country since his debut in 2012, he has played in the 2014 World Cup and was selected for two Africa Cup of Nations tournaments for Ghana.
The midfielder started his professional career in Portugal with Porto, where he was coached by former Chelsea and Tottenham manager Andre Villas Boas.
He continued his development with Rio Ave as he won the club’s player of the season award and attracted the attention of Chelsea.
The London side paid a reported fee of £3.5million for Atsu and offered him a five-year contract, with the chance to impress with Vitesse in the Eredivisie.
On his return to England 12 months ago, he agreed a loan deal to play under Roberto Martinez for Everton in the Premier League and Europa League.
Departing for international duty at the Africa Cup of Nation in January, Atsu was named the player of the tournament following a number of impressive performances.
The 23-year-old will be available to feature for the Cherries in the league, but unable to face his parent club in fixtures at the Goldsands Stadium and Stamford Bridge.
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