"Gareth has got the world at his feet," said Sunbed.
"Wales have put their faith in youngsters at the moment because they are looking to the future so playing international football for us at present might not be as big as people think.
"But if Manchester United are willing to pay £8m for a 17-year-old then that is different. That really is a recommendation.
"Also the fact he is a regular in
"If a left-back can be so influential in any side then he has to have something about him. You don't normally rely on someone in that position to be your most inspirational player.
"United are well blessed with left backs at the moment with Patrice Evra, Gabriel Heinze and Mikael Silvestre. So Gareth is obviously one more for the future.
"Players have to be careful because they can move to a bigger club and then get lost in the system.
"There is talk of him being loaned back to Southampton until the end of this season and maybe even for 18 months when his current contract is due to end anyway.
"That would be ideal for him, his education, Southampton and United."