The Daily Record says Scottish FA chiefs were tipped off by a source south of the border.
And last night they were attempting to contact Old Trafford officials in a bid to discover if the talented 18-year-old qualifies to play for them.
Welbeck grabbed the headlines when he scored on his Premiership debut against Stoke last November.
Scotland Under-21 boss Billy Stark said: "If Danny qualifies to play for Scotland then we'd be interested. It's very important to find out if he qualifies then discover what his feelings are. If we get any encouragement, we'd be looking to follow that up."