Defending champions Barcelona have been drawn against Segunda B side Hercules in the fourth round of the 2016-17 Copa del Rey, while Real Madrid will face Cultural Leonesa, also from Spain's third tier.
Fourth-tier side Formentera—the lowest-ranked team left in the competition—will face last year's beaten finalists, Sevilla, in the two-legged round of 32.
Here is the full draw:
Copa del Rey: Fourth Round Draw
| Villarreal | vs. | Toledo |
| Formentera | vs. | Sevilla |
| Cultural Leonesa | vs. |