Mumbai, Aug 29 (IANS): Actor Nawazuddin Siddiqui is upset with rumours of a cold war between him and "The Lunchbox" co-actor Irrfan. He says fighting with his "senior" is something he can't even think of.

"I don't understand from where these rumours come from. I am very disappointed. Irrfan is my senior. He is 10 years senior to me. I can't even think of fighting with him for any reason," Nawazuddin told IANS.

"I have learnt so much from him, and such rumours will only affect our relationship. I have immense respect for Irrfan," he added.

A reported rift between the two is said to have intensified recently when the makers of "The Lunchbox" asked Irrfan to supervise the international marketing campaign. Reportedly, even Nawazuddin feels he has his own popularity and could very well sell the film with his credentials.

Nawazuddin has rubbished it all.

He said: "I don't believe this. Irrfan is popular not only in India, but also at an international level. So, there was absolutely no fight on this. Besides, the film is about Irrfan and Nimrat (Kaur). I did this film only for Guneet (Monga), who is a very sweet friend and the producer of the film.

"The film has gone to Cannes International Film Festival and has been very well-received by the audience. I am proud to be associated with this product."

"The Lunchbox" is releasing in India Sep 20.