He also questioned SRK's movie selection process saying that he "should learn from Kamal's mistakes and just be Salman".
In a series of tweets, the 'Satya' filmmaker took digs at Shah Rukh's recent decision to turn into an obsessed fan in "Fan" and also upcoming Aanand L. Rai's project in which he will be seen as a dwarf. He also hinted at Kamal's "Appu Raja".
He shared: "Megastar SRK becoming ordinary fan, dwarf etc is as big a same blunder as what Kamal Haasan did to lose his stardom to Rajinikanth (Salman Khan). Kamal was as big a superstar as Rajinikanth till he started doing dwarf, fat, tall etc and as a fan I hope SRK doesn't listen to wrong advisers."
The filmmaker, who is awaiting the release of his Kannada directorial debut 'Killing Veerappan', based on the shooting down of the forest brigand, added: "SRK must learn from mistakes of Kamal and not listen to near and dear ones who are stopping him from becoming a Mega Rajinikanth.
"I call SRK as megastar because neither (he) has muscles of Salman nor workmanship of Aamir (Khan) but yet he is taller than both by being just himself. Rajinikanth is Rajinikanth because he always himself and Kamal always trying to be someone else. I hope SRK will remain like himself like Salman. Kamal could have been a better Rajinikanth if he didn't keep becoming someone else ... so SRK should learn from Kamal's mistakes and just be Salman".
The 'Aag' director also shared that "great actors" are available in abundance, but being a star comes as a blessing.
He shared: "Great actors are dime a dozen in NSD, stage etc whereas stars like SRK come blessed by God/Allah/Buddha etc, which is what SRK is not realising. Clint Eastwood super star for 30 years being himself and then is critics Hero.
I don't believe in God but as fan I pray to Allah SRK realises truth".