MD-11 Captain reported receiving a SLAT DISAG alert during approach at 4;000. The crew ran the appropriate checklists and performed a no Slat/Flaps landing.

Narrative

On downwind for approach to ZZZ ILS XXR at 4;000 feet; as we extended the slats; we received a Level 2 SLAT DISAG Alert. I (Captain) was PF at this point. We discontinued the approach and asked for radar vectors to give us more time to run the QRH procedure and evaluate the problem. We had about 25;000 lbs of fuel remaining at the start of the approach. We decided to switch roles; so I would run the checklist. The First Officer handled the aircraft and radios while I performed the QRH procedure. After finishing the QRH checklist; we had about 21;000 lbs of fuel and we decided to [request priority handling] with ATC. We performed a No slat/flaps YY ILS approach and landing on the longer Runway ZZZ XXL. We landed uneventfully. No hot brakes noted and no damage to the airplane. We terminated the [priority handling] with the fire department and taxied to our spot.I assumed the role of PF (Captain) for the landing and the First officer was PM. Cause: The Slat system malfunctioned. Suggestions: There were previous write-ups concerning the SLAT DISAG alert that were addressed. This might be an issued related to the OIL for the Slat seal temporary fix with speed tape. I can't think of any other preventative measures.