Barcelona boss Luis Enrique admits Douglas needs to do more.
The former Sao Paulo fullback has struggled to make an impression since his summer arrival.
"Every player who arrives at a new club from a different continent needs time to adapt: some need a lot of time, some little and some don't manage to adapt at all," said Enrique.
"We need Douglas to do the same thing here that he did at São Paulo. He is a player that gives us a lot of options."