Reports in Holland claims United are ready to make a £5million bid to land the teenager.
Denmark Under-19 coach Thomas Frank has hailed Fischer as the new “Lionel Messi or Cristiano Ronaldo”.
“Fischer is special. He can be just like Messi or Ronaldo,” said Frank.
“He has their ambition and talent, and he always wants to score. He is hungry, always hungry, even if he has scored two or three times.”