Babel admits his limited role is not enough and his patience is wearing thin with manager Benitez, according to The Independent.
"To be a supersub is mentally hard," Babel said. "It is clear I have enough qualities to be in the starting XI of Liverpool. But when you never get a real chance, it's difficult.
"The Liverpool fans are happy with me as a substitute, but I didn't get a chance yet as starter. I have never played three matches in a row from the start."