Dwight Yorke has admitted that at one stage he was blissfully unaware of Roy Keane’s rivalry with one Manchester United legend during his time at Old Trafford. The 52-year-old former Manchester United striker arrived at the Premier League club in 1998 after Sir Alex Ferguson signed him from Aston Villa for a £12.6m fee. Dwight Yorke had an impressive spell at Old Trafford and forged a remarkable strike partnership with fellow United legend Andy Cole under Sir Alex Ferguson. Both Andy Cole and Yorke played a key part in United’s success in the 1998-99 campaign, which culminated with the Red Dev…