The Wales international had a shoulder operation in March and then picked up a hamstring injury in September.
"I'd be lying if I said it wasn't frustrating at times," said Allen, the 23 year old.
"I'm working hard and waiting patiently for my chance, but Liverpool is a massive club and we are having a great season.
"The competition for places is really good and you want that at a top club and I have to work as hard as I can to get back into the fold.
"You want to see your team doing well, especially when you are out injured - the lift you get is from seeing your team doing well.
"Hopefully with the momentum we are gaining now we can keep going and in an ideal world I would like to be a big part of that."
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