Allen has followed Rodgers from Swansea City this summer.
"He is a manager who instils faith and confidence in you," Allen told the Daily Mail. "It really makes a difference and helps when you go out on to the pitch. I'm sure the other players here will find that out soon.
"I think they are all looking forward to it as much as me. The manager he is passionate about football. His heart will be in this job 24/7. Individually and collectively, he will give every player what they need to go out on that pitch and perform."