Manchester City boss Manuel Pellegrini says Sergio Aguero's five goals against Newcastle United show that the 27-year-old can make the difference at any time.
The Argentinean joins Andy Cole, Alan Shearer, Dimitar Berbatov and Jermain Defoe as he became the fifth player to score five goals in one Premier League match.
And the Chilean says there is more to come from the striker.
"I'm happy for Kun, he deserves it," Pellegrini said.
"He makes the difference. In the last game he missed chances but he was calm and that was key.
"To see him play at the level he played at today ... not only he must be happy but all the fans.
"He had treatment at half time, and to give him more minutes he could have scored but we must be cautious about his fitness, because he could be injured.
"It's always amazing to see a player score five goals, the important thing is that Kun did it today in a difficult game when we were 1-0 down.
"Last season Kun finished the season without any problem. He is doing a different preparation, so I'm not worried about injuries, you can be injured by kicks of course but muscle injuries he should not have any more."