York was detained by police in East Palestine, Ohio, in August on a charge of "engaging in prostitution."

US media reports said York was arrested after responding to an advert on a "known prostitution website" on August 23rd to arrange sexual activity at a mobile home park.

York's charges were subsequently amended to misdemeanor disorderly conduct and possessing criminal tools. He pleaded no contest to the two charges and was fined $1,150. However, his offenses left him in violation of the NFL's personal conduct policy, leading to his fine and suspension.

The NFL said Friday that York had already effectively served half of his suspension after staying away from the 49ers' first three regular season games.

"Those three missed games are counted toward his suspension, and he may return on Tuesday, October 20th," the league confirmed in announcing his sanction.

York, 46, said in a statement he took "full responsibility" for his actions.

"To my family, to the players, coaches, and employees of the San Francisco 49ers, to our fans and partners, I am deeply sorry," York said.

"This was an inexcusable mistake and I take full responsibility. What I did does not reflect my values or the man I strive to be for my family.

"Leading the 49ers is a privilege, and one I don't take lightly. Your trust will have to be earned back over time, and I look forward to that work ahead."

York is the principal owner and chief executive of the 49ers and is also a co-owner of English Premier League side Leeds United and Scottish giants Rangers.