Defender who began his professional career with Chelsea FC before being named Borussia Mönchengladbach's Player of the Year for 2015-16. He made his senior squad debut for the Danish national team in 2015.
He played in Brøndby IF's system from 2004 to 2012.
In 2015, he received the Danish Football Player of the Year award from the Danish Football Association.
He is the son of goalkeeper Sten Christensen.
He has played alongside Willy Caballero at Chelsea.