Christian Eriksen's return to a big tournament was the highlight of the match.
The Danish playmaker has joined United on a three-year deal.
Denmark lost 4-2 to the Netherlands in the international friendly, with Eriksen producing a stunning finish into the top corner in the 47th minute after he came on as a half-time substitute.
Denmark coach Kasper Hjulmand included midfielder Eriksen in the 23-man squad that will play against the Netherlands and Serbia in friendly internationals at the end of this month.
Eriksen has not played since suffering a cardiac arrest in Denmark's opening match of the European Championship against Finland in June.
The Danish international continues his search for a new club following a cardiac arrest on the pitch during last year's European Championship.
The brilliant Danish midfielder was resuscitated in front of shocked fans and a massive global TV audience during his nation's first match of the tournament.
Eriksen had a heart-starter device implanted after his collapse due to a cardiac arrest during Denmark's first Group B game against Finland.
Eriksen's life was saved when CPR was administered to him on the pitch and his heart was re-started with a defibrillator before he was taken to hospital, where he is recovering.
The Danish midfielder expressed gratitude for the flood of messages he had received after he suffered a cardiac arrest during their Euro 2020 opener.