We've faced the side from northern Spain twice before, but not for seven years, and it's been all change at the Basque club since then.
Sociedad currently lead La Liga and have compiled one of their best squads since they last won the Spanish top division, way back in 1982.
Here's everything you need about the team they call La Real...
A SHORT HISTORY
Formed in 1909, in the Basque city of San Sebastian, Real Sociedad have been a regular fixture in La Liga for much of their history, having been a founder member in 1929.