Hoddle believes the Manchester United winger could be exposed by Liverpool's Raheem Sterling should be play in a defensive role.
And the 57-year-old says Young finds it 'very difficult' to defend at his back post.
"My specific concern is Ashley Young playing at left back or wing back," the QPR coach wrote in his Daily Mail column.
"They got away with it at Southampton. When Shane Long got on the back post at 52 minutes on Monday, he should have made it 2-1 and that would have been a decisive moment. It was waiting to happen and had been clearly signposted. Young finds it very difficult to defend in those situations.
"Louis van Gaal has a problem on Sunday: does he stick with a back three, putting Michael Carrick in there and leaving himself vulnerable on the flanks? Young will probably be up against Sterling!"
Manchester United host Liverpool at Old Trafford at 1.30pm this afternoon.