Mumbai: All India Football Federation (AIFF) president Praful Patel on Friday said merging of I-League and Indian Super League (ISL) cannot be done overnight but decided to form a working group to work out the way to unite the two in the future.

"We are working towards one entity in future, the I-League clubs and the ISL. A working group will be formed, about nine members, to work out the way," Patel told reporters here.