Рафаэль Геррейру, Getty Images
The Portuguese bek was injured during the Confederations Cup match with Russia, which was the last for him at this tournament.
It was expected that the football player received a bruise and survived the relapse of the old injury, but a detailed examination showed that Guerreiro fractured ankle.
"Rafael Guerreiro suffered a surgical intervention. The 23-year-old will play outside the game for three to four months, "- said the official Twitter of Borussia.
In the season that ended, Guerreiro spent 35 matches for Borussia in all tournaments, scoring 9 goals and giving 9 assists.