Career
Sebastian preferably plays as a central defender, his strong abilities are his passing-skills and strong positioning. Sebastian made his debut in Allsvenskan on 22 April 2013 against Djurgårdens IF, replacing injured Jon Jönsson. He was later on invited to the to play against Switzerland and Cuba U20.
On 18 February 2016, he moved to Russia, signing a 3.5-year contract with Football Club Dynamo Moscow.
Sebastian is the younger brother of Swedish national football team midfielder Samuel Holmén. International.