"The Bears made their decision, now I have to make mine," Briggs told the Chicago Tribune Thursday. "It's just how the business works. It's not going to take away from what I do on the field. I'm 100 percent a Bear, until I'm not a Bear anymore."
Agent Drew Rosenhaus sent an email to Bears contract negotiator Cliff Stein requesting the trade, the newspaper reported.
Briggs has three years remaining on the six-year, $36 million deal he signed in 2008. He is slated to earn $3.9 million this season, $4 million in 2012 and $6.5 million in 2013.
Briggs said he was willing to wait until after the season to request a trade if the Bears didn't budge, but after speaking to general manager Jerry Angelo Sunday, he decided to move now.
"I understand and respect their decision," Briggs said, according to the newspaper.
Briggs is a six-time Pro Bowler who has spent his entire career with the Bears after being selected in the third round of the 2003 draft.