Berg told The Sun: "I can understand why people are talking about them being future managers of Man United and, for me, they would both be top candidates.
"But I'm sure the board at Old Trafford would love to be able to give it to one of their own - someone with strong United connections who had proved themselves elsewhere.
"These two were massive heroes with United's fans, so they would be given every chance to get it right."
Berg, who has been in charge at Lyn for more than two years, believes Blackburn boss Hughes would currently have a slight edge over his rival, Sunderland's Keano.
The Norwegian added: "I suppose if Sir Alex left tomorrow Sparky might be just ahead because of the experience he's had with Wales and Blackburn.
"But that's only one part of being a top boss. Some people just naturally take to it and you can't argue with what Roy has done so far.
"If either of them took over, they'd instantly have the respect of the United dressing room because of what they achieved as players.
"But respect for that reason alone doesn't last long - only about three months in my experience!"