The attacker expects a difficult encounter against Los Che, but is aiming for the full three points and added that the Santiago Bernabeu side have the best players in the world
Additionally, they have several key players in superb form and Callejon feels Madrid could struggle in this weekend's match.
However, the former Espanyol star insists that Madrid will do their utmost to bag maximum points as he feels they have the best players in the world.
"Everything about Valencia worries me. They're always strong at home and pressurise hard, complicating things for opponents. Roberto Soldado and Jordi Alba are in good form," Callejon said to bwin.com.
"However, we are Real Madrid and always try to win at every stadium. We want people to have fun with us and to play an attractive game. Our crest demands we do our best to win.
"We're a selfless team and we all work for the common good. We have the best players in the world. We work well and people have fun watching us play. This is a straightforward team that has many chances to score and likes to play appealing football."
Real Madrid currently sit top of La Liga with 28 points from 11 games, while Valencia are third in the table.