The young Swede is being linked with a £13 million move to Old Trafford in January.
"One should not be surprised at anything in terms of Rasmus," said Patrick Mork. "He is now seen as the hottest player in Holland, and such a player obviously has a very high status in Europe.
"I cannot comment on individual clubs, although I know what is happening. So, I must be boring, but I can say that many of the biggest clubs follow Rasmus."