An adjustable loop knotless anchor assembly having an adjustable loop suture element that utilizes an adjustable or sliding knot for length adjustment during a tissue repair. The slidable knot is located on a sleeve that is placed into a bone mass for capturing an anchor element. The anchor element captures the adjustable loop and then is inserted into the sleeve. The anchor element is adjusted for securing it in a locked position within the sleeve for secure attachment of the anchor element therein.