The Spaniard found the target during his new side's 3-0 win over Bologna on Sunday and is determined to continue in the same vein for the rest of the season
Rafa Benitez's men made a flying start to the season, vanquishing their opponents to go top of the Serie A table after matchday 1.
And Callejon is delighted with the way he has started life at the club but stressed that the team's fortunes count above his own.
"I'm very happy about the game and also for the goal, but the team and our hard work is more important.
"We started a difficult championship well and we want to thank the fans. There are still a lot of games, but we got the three points and that's the most important thing.
"It is always difficult to win. Every team that comes to the San Paolo want to trouble us. But we were calm, we did our job in attack very well and created opportunities and did well together in defence too.
"When I scored, I felt a huge thrill, I was very happy. We have to continue like this."