"It's a complicated group because on paper you can think we will be favourites but then we have to show it where it is most difficult, on the field," Luis Enrique told Spanish television's Teledeporte.
"It is true that in this group we have been given there will not be any easy games, all of them will be competitive."
The top two teams from each group will qualify and games will take place between March and November 2019.
"In this case we have Bilbao, we love that and I hope we can take advantage of it.
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