After a lifelong love of the contest, Af Sillén became the Swedish commentator in 2009 for SVT. The following year he wrote his first "Eurovision Song Contest" for Oslo 2010. His commentary continued until 2012 when Loreen won the competition for Sweden. The following year Af Sillén wrote and directed the 58th Eurovision in Malmö 2013. In 2015 he was asked by the BBC to co-write the script of the "Eurovision's Greatest Hits" hosted by Graham Norton and Petra Mede for a celebration of Eurovision’s 60th year.