Bournemouth have completed the signing of Nathan Ake from Chelsea in a club-record transfer.
Sources told ESPN FC on Wednesday that Ake, who can play left-back, centre-back or defensive midfield, would leave Chelsea in a deal worth £20 million.
"I had a great time here last season so I'm really happy to be back," Ake told the club's official website. "It's an exciting challenge. Chelsea is a great club and I learned so much there but this is a new step and the right place for me to develop even more.
"The fans haven't seen the best of me yet. I always set the bar high so I know there is a lot of things I still have to work on. With the help of the manager here I know I can keep improving and become a better player."
Bournemouth manager Eddie Howe added: "I am delighted that we have completed the signing of Nathan on a permanent basis. He is someone we know all about, having had a very successful loan spell here last season.
"Nathan is an outstanding young player with a fantastic attitude and a great desire to learn and develop. He has a very bright future ahead of him and I'm very pleased to say that future is here."
The Blues have already raised around £42m from the sales of Begovic, Juan Cuadrado, Christian Atsu and Bertrand Traore this summer, as they prepare for a spending spree intended to equip Conte with a squad capable of challenging in the Champions League next season.
Tiemoue Bakayoko is set to become Chelsea's first new signing once the details of a deal with Monaco are finalised, while Juventus wing-back Alex Sandro has also been heavily linked with a move to Stamford Bridge, and talks are ongoing with Everton over striker Romelu Lukaku.