The youngster was spotted by United scouts playing for Denmark's Under-16 side at the Aegean Cup in Turkey this January and has also been watched by academy director Brian McClair.
He is currently on the books of Danish Superliga side AGF Aarhus where he plays for their Under-17s and will be accompanied to his trial by the club's sporting director Brian Steen Nielsen.
"It's clearly going to be a great learning experience that Lars can use in his further development," said Nielsen.
"He has been developing rapidly since joining AGF, and is now being rewarded with this chance."
Nielsen has been impressed by United's handling of the situation from the time that he was made aware of their interest in the schoolboy, who signed a three-year youth contract with the club last year.
"Right from the first contact Manchester United have acted very professionally. They have had several scouts and their academy director over to follow Lars and I had a meeting with them about the test training [period]. They have done a thorough job, and we have therefore said thanks for the invitation."