We did well waiting for the 'right man' Diego Costa: Mourinho

Diego Costa left the Stamford Bridge pitch to exultant cheers after a hat-trick against Swansea City on Saturday highlighted a breathless start to a Chelsea career for a team that has been designed around him.

Manager Jose Mourinho said he had built his side to accommodate the powerful Brazil-born Spanish striker but he also tried to calm expectations and take the pressure off his new recruit.

"If the team plays well he has to score goals," Mourinho told reporters after a 4-2 win opened a two-point gap for Chelsea at the top of the Premier League.

"But seven goals in four matches is maybe too much. You can not expect that he will score eight in 14 games.

"It's not normal," added Mourinho in answer to a crowd that chanted 'he scores when he wants' after Costa, returning from a hamstring injury picked up on international duty, completed his treble in the 67th minute before giving way to fellow new signing Loic Remy.

The manager said that since he arrived for his second spell at Chelsea last season he had constructed a side that would need a "certain type of striker".

Out went expensive flop Fernando Torres, Demba Ba and stop-gap Samuel Eto'o and in came Costa and France frontman Remy who scored Chelsea's fourth on his debut against Swansea.

"We did well waiting and waiting for the right man," Mourinho said of Costa.

Mourinho was anxious to play down Costa's exploits, saying: "You want to speak about names and players and I want to talk about the team and collective.

"Maybe there were players you didn't see that were fantastic, for example Ramires."

Such was Costa's impact the crowd barely noticed their hero Didier Drogba did not even make the bench.

Drogba began a second spell at the club in the close season and Mourinho dismissed comparisons between Costa and the 36-year-old Ivorian who spent eight campaigns at Stamford Bridge before leaving in 2012.

"Didier had a fantastic career at Chelsea but we can't compare the players and the teams. Diego plays in a different team with a different style," he said.