By Mark Jones Gary Neville thinks three men who are being linked with what could become a managerial vacancy at Manchester United simply don’t look like Old Trafford bosses. New United minority owner Sir Jim Ratcliffe is said to be ready to dismiss current boss Erik ten Hag if United fail to qualify for the Champions League this season, with several names in the frame to replace him. Ex-England boss Gareth Southgate is said to be at the top of the list of Ratcliffe’s targets, while the ex-Brighton and Chelsea boss Graham Potter and Wolves’ Gary O’Neil have also been linked, although the latter…