Chelsea manager Thomas Tuchel has warned there is much more to come from Romelu Lukaku.
The Belgian was dominant on debut against Arsenal at the Emirates on Sunday, scoring the opening goal in the 2-0 victory.
And Tuchel expects Lukaku to get better and better throughout the season.
"It was a very good start," Tuchel said. "That's the best thing when your new strikers scores straight away and an important goal to get the lead, 1-0 to us.
"On top of that, he linked up well with Mason Mount and Kai Havertz to bring something to our game. We could play very direct up front to the last line. He was very dangerous through the whole game because they are also dangerous in counter-attacks. We brought him into the game very well already.
"Now, it is about details. Of course, there's some things to improve. He almost scored a second one, but it was a fantastic save from Bernd Leno and it was a very good debut.
"He linked up well with us and now it the moment to continue and improve.
"His profile gives something that we did not have so much. We can overcome pressing with long balls and if we are close to the box we can also play into him. He is a very physical player, he gives strength to our counter attacks because he likes to run into spaces so.
"He was involved in training, with the guys. He is very smart, a very open and friendly person so it was easy to connect with everybody. They like to play with each other so it was very important it gives us more opportunities.
"At the same time we work on the details and keep going... and there is a lot more to come.
"His profile gives us something that we did not have so much. We can overcome pressing with long balls and if we are close to the box we can also play into him.
"He is a very physical player, he gives strength to our counter attacks because he likes to run into spaces."