Rumour mills are abuzz with the news that "Sultan" director Ali Abbas Zafar is having a tough time dealing with Salman Khan on the sets of "Sultan."

"Sultan" is one of the biggest films for Ali, as it features Salman in the lead role, but the director is reportedly finding it difficult to work with the actor. Apparently, Salman's chilled out behaviour on the sets of "Sultan" has caused trouble for the director.

Spotboye.com reports that Ali finds it difficult to convince Salman to re-shoot few scenes.

This is not the first time; in the past, few filmmakers have had issues working with Salman. Kabir Khan and Salman collaborated for two big projects -- "Bajrangi Bhaijaan" and "Ek Tha Tiger" -- in past, but the journey wasn't easy.

Kabir had issues with Salman during the shooting of both the films, but the director-actor resolved all the differences. In 2015, Kabir revealed that there were clashes between him and Salman during the shooting of "Ek Tha Tiger."

"There was clash between Salman and me while we were working on 'Ek Tha Tiger'. There was tussle between us and I feel it's OK to have such things. As we were working for the first tíme together, there was debate over how to work out things. Without such involvement, an actor would become brain dead," Kabir told reporters at a promotional event of "Bajrangi Bhaijaan," according to Press Trust of India.

"This was the second tíme (in 'Bajrangi...') we were working together so there was mutual understanding. We had great fun...the journey was positive and it shows on screen," he said.

Despite all the differences, Kabir and Salman delivered two biggest hits of Bollywood and now we can only hope that Ali's directorial "Sultan" will turn out to be a blockbuster hit.

"Sultan," produced under Yash Raj Films banner, features Salman, Anushka Sharma, Randeep Hooda and Amit Sadh in pivotal roles. The film is slated for Eid 2016 release worldwide.