David Moyes needs to be questioned for removing Manchester United's long-standing coaching staff in summer 2013, according to former club captain Bryan Robson.
Sunderland manager Moyes, who was in charge at United for 10 months of the 2013-14 season, returns to Old Trafford for a Premier League match on Boxing Day.
While the Scot was at the club, he removed coaches Mike Phelan, Rene Meulensteen and Eric Steele -- and brought in Steve Round, Jimmy Lumsden, Phil Neville and Chris Woods.
Robson told The Sun: "David was walking into the biggest job in the world and replacing the most successful manager in the world [Sir Alex Ferguson] but he needed the right help.