In December 2010, Jensen made his second appearance at the under-20 level in the 2011 IIHF World Junior Championships' Division I tournament, held in Slovenia. Recording two goals and five points over five games, as well as a team-leading 28 shots on goal, he helped Denmark to the top spot in their pool and a promotion to the top division for the 2012 tournament. Denmark had tied with Slovenia for first place in Pool B with four wins and one loss each, but won by virtue of having won their game against them 2–1.