By Jake Polden Roy Keane summed up the size of the task facing Erik ten Hag and Manchester United this Sunday by simply announcing: “Oh my goodness!” Keane isn’t known for heaping unnecessary praise on players but made it clear he believes the pairing of Erling Haaland and Kevin De Bruyne in the Man City midfield poses a huge problem for his former team. Speaking on Sky Sports, ahead of the Manchester derby, in which Haaland and De Bruyne start alongside each other for only the fourth time this season, Keane said: “I think Pep will be delighted. “Looking at his bench there, considering where t…