Barcelona full-back Douglas will miss the start of the 2015-16 campaign because of a hamstring injury.
Douglas, 24, sustained the problem in the 16th minute of Barca's penalty shootout defeat to Chelsea on Tuesday in Washington DC and was replaced by Sergi Roberto.
The match ended 2-2 and was then won 4-2 on penalties by the Premier League champions.
A statement from Barcelona read: "Douglas has suffered a hamstring injury in his right leg. He is expected to be out for around eight weeks."
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