Watts has called time at Port Adelaide, succumbing to the toll of recovering from a horror leg injury which prevented him playing this season.

Watts was taken by Melbourne with pick No.1 at the 2008 national draft.

But the precocious talent became a whipping boy at the Demons, with many fans believing he never lived up to hype of being a No.1 draft selection.

After playing 152 games at Melbourne from 2009 to 2017, Watts was traded to Port Adelaide, which gave up pick 31 for the utility.

He managed 21 games for the Power but suffered a graphic injury last March, breaking his right leg and dislocating his right ankle when trapped in a tackle.

The injury followed a torrid off-season when lewd text messages he allegedly sent to a woman were leaked online.

Soon after, a video emerged of the 28-year-old snorting a legal menthol-based powder from a woman's chest at the infamous Oktoberfest in Munich.

The 29-year-old retired on Thursday, citing the mental and physical toll of trying to recover from his injury as a major factor.

"I have been thinking long and hard about my future for a while and contemplating retirement," Watts said in a statement.

"Since my injury, I feel my body has let me down and I have been struggling with the physical and mental requirements of getting back to the level of fitness that is required at AFL level.

"It feels like the right decision for me to step away and look for new challenges in the next phase of my life.

"I feel lucky to have had 12 years in the game and while there have been some challenges, there have also been some amazing memories both at Melbourne and Port Adelaide.

"I'm not sure what the future holds just yet but I'm looking forward to some time away from the limelight."

Port coach Ken Hinkley said Watts was misunderstood by the wider football community.

"We all know Jack's football ability, and we would have liked to have seen him on the field a lot more for our club," Hinkley said.

"People might not realise just how important and loved he is around our playing group because of his character.

"Jack always has a way of lifting everyone's spirits, even when things weren't going so well for him in the last couple of years."

Australian Associated Press