The Porcupine Warriors midfielder has completed a four-year deal with the La Liga side and will now join compatriot Boakye-Yiadom
The Black Satellites midfielder sealed a four-year deal with the newly-promoted Spanish La Liga side after impressing in a two-week trial.
His agent Oliver Arthur has confirmed the pact.
Anaba was part of the Bronze-winning Ghana Under-20 side that took part in the World Youth Championship in Turkey this year.
He will now join Black Stars striker Richmond Boakye-Yiadom who is on loan from Juventus.