The Hoops' fate lies in their own hands as they need just a point to stave off relegation but they must travel to league leaders Manchester City, who need a win to guarantee the Premier League crown.
With so much at stake, several newspapers have reported Hughes will receive a hefty pay day should QPR retain their top-flight status.
Joorabchian, though, claims Hughes, who took over as R's manager in January after Neil Warnock was sacked, is at the London club for the long haul.
"He knew he was taking the job in the middle of the season, quite late on in January," Joorabchian told Sky Sports News.
"The directive of the owners and the chief executive there was that they wanted to build the club from the base up and they were looking for the right man to do it.
"If it meant it would take a few years to build it then that's how it was and that was the whole thing of signing (Hughes) in that there was no bonus at all for him or his team for staying up."
QPR are in pole position to retain their top-flight status, lying two points ahead of 18th-placed Bolton.
And Joorabchian added Hughes is in a positive mindset ahead of the clash with his former employers at the Etihad Stadium.
"He's in a good frame of mind as they've got some very, very interesting results over the last few weeks," said Joorabchian.
"They've managed to beat Tottenham, Liverpool and Stoke at home, which is quite an achievement.
"So the side is improving and I think the idea is as of next year - should they be in the Premier League - Mark will look to build the side and take the club further."