By Grey Whitebloom The last time Enzo Maresca shared the surroundings of a professional football pitch with Ruud van Nistelrooy, less than 14,000 fans were watching on in Osasuna’s El Sadar stadium. A fully packed Old Trafford will be the setting when the two former Malaga teammates face off on Sunday afternoon, as the Dutch coach continues his interim tenure at Manchester United with a visit from Chelsea in the Premier League. While the old friends share a meaty embrace on the touchline, there will be little warmth between the two sets of players battling for a crucial top-flight victory. Her…