Liverpool legend Graeme Souness has insisted that one Manchester United star should have been “approaching” the prime period of his footballing career, despite falling well short of it. Manchester United have endured an up-and-down season under manager Erik ten Hag, whose long-term future at Old Trafford is shrouded in uncertainty. Erik ten Hag has come under mounting pressure in the current campaign after United have underwhelmed in a lacklustre Premier League season. The Red Devils fell well short of challenging for the Premier League top four and are highly unlikely to secure Champions Leag…