Newcastle coach Gary van Egmond says two seasons without finals means there's no room for complacency as the Jets prepare to host the A-League's cellar dwellers after beating the league leaders.
Buoyed by a five-match unbeaten streak including a 2-1 last-start win over early-season pacesetters Brisbane, the Jets play winless Melbourne Heart at Hunter Stadium on Sunday.
The win over Brisbane elevated Newcastle to third, but the pragmatic van Egmond wasn't getting carried away with their fine start.
Heart have notched just two points and two goals from six games and are notorious for struggling away from home.
Van Egmond clearly has no intention of allowing Newcastle's mindset to waver in a match that has banana skin potential for the Jets.
"We haven't played finals two years in a row, so there's no room for complacency in our team," van Egmond told AAP.
"Every game we have to go out with the attitude and mentality to win the game.
"We have to go out and really back ourselves and work for each other and keep on doing what we've been doing."
Newcastle have lost defenders Kew Jaliens and Connor Chapman to suspension and injury respectively.
However, van Egmond said marquee striker Emile Heskey was getting close to full fitness after his early-season injury woes and could start Sunday's game or the Jets' next match.
Heart will again be without injured captain Harry Kewell.
But van Egmond was wary of the visitors' other attacking players, despite the Victorian team's poor goal-scoring record.
"Their front three is very dangerous. David Williams, Mate Dugandzic and Michael Mifsud," van Egmond said.
Battling Heart coach John Aloisi had no illusions about the task facing his side this week.
"We know it's going to be a tough game because Newcastle are a team that works very hard," Aloisi said.