"Raphael Guerreiro is a technically experienced player who is equally comfortable in several positions," Dortmund sporting director Michael Zorc told the club's website (www.bvb.de)
"We are very happy that he has decided to come to Borussia Dortmund."
Guerreiro joins Turkish teenager Emre Mor and midfielder Sebastian Rode, who have already penned deals with last season's German Bundesliga runners-up.
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(Reporting by Nivedita Shankar in Bengaluru; Editing by Toby Chopra)
