WWE star The Undertaker has been seen entering a New York hospital with his wife, Michelle McCool.

The Wrestling legend — real name Mark William Calaway — was visiting the Hospital for Special Surgery amid a Wrestling Observer report that he would require hip replacement surgery.

The Undertaker, 52, retired after his loss to Roman Reigns at WrestleMania 33.

It is believed he had been delaying the operation until he quit the squared circle and is now expected to undergo a number of procedures.

Fans were left in floods of tears after he called time on a 27-year career.

The Phenom was involved in a brutal final match, a loss to Reigns that ended his Wrestlemania record at 23-2.

After the defeat, he took off his hat, coat and MMA-style gloves and placed them in the middle of the ring — a sign that he has ended his in-ring career.

The Undertaker then made his way up the long ramp, raised his arm in the air and disappeared slowly down the trap door he came from earlier.