The Morocco international came on as a second-half substitute in Saturday's 1-1 draw with Blackburn Rovers at Loftus Road.
"It is not a case of anybody giving him advice, it is whether it is taken on board," he told Absolute Radio's Rock 'n' Roll Football.
"At the end of the day, this is the top level of world football and if you're not prepared to work hard you will come up massively short.
"If I was Adel and had Adel's ability, I would not want to be coming up short having not worked hard enough.
"I came here and was told he was a genius, but I'm yet to see it. I don't know whether that is because he doesn't work hard enough or that he tends to sulk.
"I am happy that he is upset really because it shows he does care. [That said], there is a way of doing it.
"He is not the only one guilty of it and that is what we have to understand here. There were a few lads not selected whose heads went down and maybe they could apply themselves better.
"It is one of those things. There is going to be a 14 or 15-man squad that keeps you in the league this year and everyone has to buy into it.
"There will be times when players come in and out but their attitude, their reaction, is going to be the most important thing - not getting the bus home with fans and storming off.
"Adel knows that and it would have been nice of him to come in and apologise for doing that.
"He didn't think he needed to and some of the senior players maybe feel like he should have."