Updated

San Francisco 49ers starting cornerback Tarell Brown has voided a $2 million escalator in his contract after he chose not to participate in the team's voluntary offseason program. Yet Brown says he learned of it via Twitter on Thursday because he didn't know about that clause in the deal, and he then fired agent Brian Overstreet for the mistake.

He had been due to earn $2.925 million in salary for the 2013 season. The 28-year-old Brown, who is entering his contract year and currently without an agent, worked out on his own this offseason — something he says he has routinely done.

Brown called it an "unfortunate situation" while adding, "no one wants to leave money on the table."

A call and email to Overstreet weren't immediately returned Thursday evening.