Mason Greenwood donned the club's iconic No.7 jersey during a practice match at Old Trafford.The 18-year-old has enjoyed a breakthrough season for United scoring 12 goals in all competitions, including five in just four Premier League starts.Greenwood ordinarily wears the No.26 for United but he wore the No.7 as United's players returned to their home stadium for a run-out on Saturday.United stepped up their preparations for a return to Premier League action with an intra-squad friendly to help