The Wales midfielder has not featured since suffering a hamstring injury in the Capital One Cup defeat of Notts County seven weeks ago.
Allen told the club’s website: “I’ve been pretty open - last year didn’t quite go as well as I hoped.
“There were certain games and moments where I did well - the key is to get that consistently.
“A lot of people have spoken to me, fellow players have said about moving to a different club for the first time. It is the first time I have experienced that.
“That’s out of the way now, so hopefully I’m a year on and a year more experienced because of that.”
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