The 23-year-old Wales midfielder will miss the rest of this campaign having gone under the knife to correct the long-standing issue with his left shoulder, which had left him in discomfort while playing. Allen's form tailed off as the season went on, but he hopes with a full pre-season behind him he can win the approval of the Reds' faithful.
He told the club website: "The fans have definitely not seen the best of me yet. It's no secret that recent months haven't gone great for me. I am confident and faithful that next season I can perform a lot better. Unfortunately this season's a write-off in regards to the injury but the plan is, and I've got a bit of time, to make sure it's right over the summer break in time for pre-season."
He added: "It's difficult to say [whether the injury affected my game] - I don't want to use it as an excuse, that's for sure. But I'd like to see how it is once it's fixed and I'd like to think it's going to help me massively. I'm excited and looking forward to being 100 per cent fit. These things can often play on your mind. Hopefully this will bring out the best in me."
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Source: PA