RICHMOND, Va., Aug. 20 — Michael Vick, the star quarterback of the Atlanta Falcons, has accepted a plea offer from federal prosecutors in a criminal case stemming from a dog-fighting ring that was run from a property Mr. Vick owned.

Mr. Vick will probably face a sentence of at least a year in prison under the deal. His future in the National Football League appears bleak.

Mr. Vick is expected to formally enter his plea on Aug. 27. The United States District Judge overseeing the case, Henry E. Hudson, announced the agreement at a status hearing in the case this afternoon.

Billy Martin, one of Mr. Vick’s defense lawyers, said in a written statement: “After consulting with his family over the weekend, Michael Vick asked that I announce today that he has reached an agreement with federal prosecutors regarding the charges pending against him. Mr. Vick has agreed to enter a plea of guilty to those charges and to accept full responsibility for his actions and the mistakes he has made. Michael wishes to apologize again to everyone who has been hurt by this matter.”