India batter Cheteshwar Pujara believes it's impossible to have both Rishabh Pant and Dinesh Karthik in the playing XI during the Asia Cup, given the India team management is unlikely to make changes in the top order -- comprising KL Rahul, Rohit Sharma, Virat Kohli and Suryakumar Yadav -- and the duo are known to play specialised roles in the side.