The 19-year-old defender has impressed while on loan at Bundesliga side Borussia Monchengladbach.
Barcelona scouts have reportedly watched the Denmark international in action several times this season.
Mundo Deportivo reports that Barcelona could make a bid for the young defender in the summer.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.