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Dortmund signed Guerreiro after his departure from Lorient. The Portuguese left-back joined the German club in 2016 and has since become a key player for them. He has made over 150 appearances for Dortmund, scoring 14 goals and providing 30 assists. Guerreiro has won the DFB-Pokal with Dortmund in 2017 and 2021, and has also been named in the Bundesliga Team of the Season twice.