Despite only featuring in pre-season friendly matches so far, it appears Diego Costa has slotted into Jose Mourinho's side perfectly.
The Braziian-born, Spain striker scored both goals on his Stamford Bridge debut last night as Chelsea beat Spanish side Real Sociedad 2-0.
The double last night took the 25-year-old's preseason tally to four goals, and he appears to already be a firm favourite with the Chelsea faithful, as he received a well-deserved standing ovation when he was replaced by fellow countrymen Fernando Torres on the hour mark.
Chelsea swooped on Atlético Madrid this summer, signing both Costa and Filipe Luis from the La Liga champions.
Filipe Luis praised the striker whilst speaking to the official Chelsea magazine: “Diego is an unbelievable player – you are going to love him, because he gives everything for the shirt.
“If he isn’t already the best number nine in the world, he will be very soon.
“He’s a brilliant player with a big heart and I’m very happy he’s here with me because he’ll help me grow as a Chelsea player.
“I know him very well and I know he fights for every ball. If I have won the ball in a forward area of the pitch, I know I have to look to give it to him because he is better than me in front of goal.
“So, I always try to find him, look where he is and get the ball to him, because I know he is going to score.”
Being called the 'best number nine in the world' is certainly high praise for a striker who only really came into the spotlight last season. He will have to compete with the likes of Radamel Falcao, Zlatan Ibrahimovic and Robin van Persie for that title, but his advantage is that he does have age on his side.
Many questioned whether Costa would be a hit in the Premier League after a very disappointing World Cup for the man who scored 27-La Liga goals last season.
But such has his impact already been that Mourinho has labelled the hard-working frontman 'a bargain' at £32 million.
Can Diego Costa become the world's best number nine?