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Buatsi will be promoted by Eddie Hearn but his career guided by heavyweight world champion Joshua.
The 24-year-old is expected to box eight times before the end of the year and will make his debut on July 1.
Buatsi was one of the most exciting fighters at the Rio Olympics last year as he finished third in the light-heavyweight competition.
He also won bronze at the European Championship in 2015.
Buatsi joins fellow Olympians Joe Cordina, Lawrence Okolie - who is also managed by Joshua - and Anthony Fowler in teaming up with Hearn.
http://www.mirror.co.uk/sport/boxing/anthony-joshua-signs-joshua-buatsi-10563154
The 24-year-old is expected to box eight times before the end of the year and will make his debut on July 1.
Buatsi was one of the most exciting fighters at the Rio Olympics last year as he finished third in the light-heavyweight competition.
He also won bronze at the European Championship in 2015.
Buatsi joins fellow Olympians Joe Cordina, Lawrence Okolie - who is also managed by Joshua - and Anthony Fowler in teaming up with Hearn.
http://www.mirror.co.uk/sport/boxing/anthony-joshua-signs-joshua-buatsi-10563154