Chelsea chief executive Peter Kenyon says it's unlikely they will sign any new players before the end of the transfer window next week.

The Blues have brought in Nemanja Matic, Daniel Sturridge, Ross Turnbull and Yuri Zhirkov so far this summer while star striker Didier Didier committed their future to the club by signing a new contract.

And having made a 100% start to the Premier League campaign after three games - as well as clinching the Community Shield against Manchester United - Kenyon feels there's little reason to add further to the Chelsea squad.

"We have concentrated on re-signing the players we wanted and that has been really successful," said Kenyon. "We have had a great start to the season and (manager) Carlo Ancelotti, before he joined, was very happy with the squad, and we have strengthened that with Yuri Zhirkov.

"We are happy with the squad and we believe this year we can go on further."

Meanwhile Kenyon was more than happy with the outcome of the Champions League draw, which put Chelsea in a group with Atletico Madrid, Porto and Apoel Nicosia.

Portuguese champions Porto have been frequent recent opponents for Chelsea, having faced the Blues in the group stage in 2004/05 and the quarter-finals in 2006/07.

Atletico Madrid, who finished fourth in Spain last season, will be new opponents for the Londoners while Apoel, from the Cyprus capital Nicosia, came through the qualifiers by beating FC Copenhagen.

"We have to generally be pleased with the draw," said Kenyon. "There are no easy games and no easy groups but overall there is not too much travel and we managed to avoid one of the big ones.

"We have played Porto twice in the competition and ex-Porto players have been an important part of Chelsea's history. We know Porto better than most."