The Los Angeles superstar just announced his decision on social media ... revealing that after 10 seasons with the Rams, he's hanging up his cleats.

In his announcement post, the 32-year-old thanked L.A.'s org. and its fans ... before explaining he's now hoping that without football in his life, he'll be able to spend plenty more time with his wife and kids.

"Throughout my career," Donald said, "I have given my everything to football both mentally and physically -- 365 days a year was dedicated to becoming the best possible player I could be."

"I respected this game like no other and I'm blessed to be able to conclude my NFL career with the same franchise that drafted me."

Donald was picked by the Rams in the first round of the 2014 NFL Draft and he immediately became one of the team's best players. In his first year, he started 12 games and won Defensive Rookie of the Year honors.

He went on to make the Pro Bowl in every season he played in ... and was named an All-Pro eight total times. He also won Defensive Player of the Year honors three times.

Most didn't expect him to retire this offseason -- as he was still playing at an extremely high level. However, rumors of him possibly turning in his helmet have swirled since 2022, when it was revealed that he had previously only envisioned playing eight seasons.

The only question that remains surrounding his career is not if he'll get a gold jacket in five years -- but whether or not he'll be remembered as the greatest defensive tackle ever.