Chelsea have completed the signing of Bolton Wanderers defender Gary Cahill. The fee is reported to be initially £7m.

The England international, 26, told his new club’s official website: “Chelsea is a massive club, it is a club that looks to win trophies season in season out and it is a big opportunity for me to be a part of that. Opportunities like this you can’t turn down.”

Bolton Wanderers have taken Chelsea winger Gael Kakuta on loan for the next six months.

The 20-year-old Frenchman spent the latter half of the season on loan with Fulham last season.

Bolton manager Owen Coyle told his club’s official website: “I’m delighted that Chelsea have enabled us to take Gael on loan and I’d like to thank [Chelsea manager] Andre [Villas-Boas] and the club for that.

“He is someone whose progress we have tracked since he first broke into the Chelsea first team a couple of years ago. He is skilful, quick, exciting to watch and I’m really looking forward to working with him.”

Bolton Wanderers have completed the signing of Liverpool striker David Ngog for an undisclosed fee.

The 22-year-old Frenchman has put pen to paper on a three-year contract at the Reebok Stadium.

Bolton manager Owen Coyle told his club’s official website: “David will be a great addition to our squad.

“He is quick, can score goals and he knows what the Barclays Premier League is all about. Added to that there is his European experience with Liverpool in the Champions and Europa Leagues.

“He has represented his country at a host of junior levels and he will offer our team further attacking options. We are delighted to bring another quality, young prospect to Bolton.”

Bolton Wanderers have taken Manchester City defender Dedryck Boyata on a one-year loan.

Bolton manager Owen Coyle told his club’s official website: “I am delighted that we have completed the loan deal for Dedryck because there was interest from a number of other clubs in taking him on loan.

“To bring in a player of Dedryck’s age and quality is something, as we have shown before, that we like to do.

“He is a tremendous addition to the squad and his versatility means that he can operate at centre-half and full-back. He has got pace and power and is a flexible and dynamic player.”

Boyata, a Belgian international said: “I’m really looking forward to working with the manager. I have seen how he got the best out of young players like Jack Wilshere and Daniel Sturridge.

“I am only 20-years-old and I’m still learning and trying to improve. To come to Bolton Wanderers for a loan period is a great opportunity to do that.”