By Simon Mullock Erik ten Hag insists he never wavered in his belief that he could turn Manchester United’s fortunes around – but warned that the Reds’ season is still in the balance. United are back in the hunt for Champions League qualification after a six-game unbeaten run that has also taken them into the fifth round of the FA Cup. Ten Hag’s position at Old Trafford has come under increasing scrutiny during a campaign, which has seen his team crash out of Europe and lose 14 of their 34 games. And the Dutchman seemed to suggest that he still feels he has to prove himself to United’s new co…