New Delhi, Jan 9 (ANI): Bollywood actor Nawazuddin Siddiqui says that there is no rivalry between him and his 'The Lunchbox' co-star Irrfan Khan. "We were never friends earlier also and not now as well. We work together whenever we are cast in a film together. In the future if I get to work with him I will surely do it. There is no rivalry with him. There is nothing like that. He is my senior and I respect him a lot," Nawazuddin said.