Heidenheim vs. Chelsea: A story of the Premier League side's mixed experiences of Germany since 2005
When Chelsea returned to Germany in 2006, they succumbed to a surprise 1-0 loss at the hands of Werder Bremen, Per Mertesacker netting the decisive goal before his eventual transfer to Arsenal. Prior to winning the 2012 competition, Chelsea's progress to the last 16 had been put at risk by a 2-1 reverse to Bayer Leverkusen.