At the beginning of the 2013–14 season, Klopp extended his contract until June 2018. Klopp received a fine of €10,000 on 17 March 2014 after getting sent off from a Bundesliga match against Borussia Mönchengladbach. The ejection was a result of "verbal attack" on the referee, Deniz Aytekin, who stated that Klopp's behaviour was "rude on more than one occasion". Borussia Dortmund vorstand chairman Hans-Joachim Watzke stated that "I have to support Jürgen Klopp 100 percent in this case" because he saw no reason for a fine and denied that Klopp insulted the fourth official. Dortmund finished the 2013–14 season in second place. On 4 January 2014 it was announced that Klopp's star striker Robert Lewandowski signed a pre-contract agreement to join Bayern Munich at the end of the season, becoming the second key player after Götze to leave the club within a year. Also during the 2013–14 season, Dortmund won the 2013 DFL-Supercup, but were knocked out of the Champions League in the quarter-finals by eventual champions Real Madrid.