Leeds United have been told that they may find it difficult to convince Jamie Shackleton of signing a new contract with the versatile ace set to see his current deal expire in June. The 24-year-old is now in the final few months of his Leeds deal and a decision will have to be made on the England U20 star’s future. It comes after returning to the Elland Road fold under boss Daniel Farke. A bit of a forgotten man after an indifferent loan at Millwall, Shackleton came back to Leeds and it was expected he would be allowed to move on. Shackleton’s agent even said he would leave permanently. But ha…