Having both won their last 16 ties this week, the Clasico giants have been drawn fellow La Liga sides in the final eight of the competition
Barcelona will hope to put their Anoeta troubles behind them when they meet Real Sociedad in the first leg of the Copa del Rey quarter-final.
The Spanish champions have not won in San Sebastian since 2007 and needed a Lionel Messi strike to earn a point in their league visit in November.
They will get a chance to end that winless run of eight matches on January 17, though, before the return leg at Camp Nou a week later.