Rio Ferdinand feels Jose Mourinho's team need to mirror Real Madrid and Barcelona's all-conquering sides.
Spanish midfielder also admitted that he will miss Diego Costa at Stamford Bridge.
Bartomeu keeps insists there is an agreement but club are still to confirm the extension.
Barcelona secured a 6-1 victory on Tuesday as Lionel Messi scored four goals.
Real Madrid star recently confirmed the Catalans made an approach to lure him away from Los Blancos.
Lionel Messi's upcoming international commitments make the pair's success crucial.
Josep Maria Bartomeu insisted Messi's father has already signed agreement on behalf of his son.
Josep Maria Bartomeu says both players will stay at the Nou Camp for as long as they want.
The Argentine struck his 38th club hat-trick on Saturday in a 5-0 rout over Espanyol.
Messi's father has already signed a deal on behalf of his son, according to Barca's president.
Perez's first spell as Real Madrid president began in 2000.
Ivan Rakitic was also back in the Thursday's workout despite suffering an injury with Croatia.
The Spain international's current deal is set to expire next summer.
Josep Maria Bartomeu says that the official announcement should be done within a month.
Messi, 30, is in the final year of his Barca contract.
Serie A side were reportedly ready to pay around £27.5m to sign the midfielder.
Director Albert Soler claims Argentine will formally sign new deal agreement soon.
France starlet has agreed a five-year deal to become the Catalan's fifth signing of the summer.
Spaniard says that his teammate "loves Barcelona more than anyone".
The midfielder insisted last night he has not played his last game for the French side.
"Someone might if they have the money and want to spend it," says Manchester City boss.
Ernesto Valverde addressed the media following the Catalans' 2-0 win over Real Betis.