Boss Jose Mourinho knows that Chelsea's rivals will strengthen their squads during the summer and he is ready to counter attack.
The Portuguese is set to continue his excellent relationship with Atletico Madrid by making an offer for former Real Sociedad man Antoine Griezmann.
The Frenchman is one of the most promising players in the Spanish Liga and was already close to a possible move to the English Premier League last summer when Arsenal were reportedly interested.
The 24-year-old has a £47million release clause in his current contract but the Blues are hoping to secure the services of the Frenchman for less.
At Real Sociedad, the Frenchman scored 52 goals in 202 appearances before improving his ratio by netting 25 goals in 53 games for Diego Simeone's side.