LAKE FOREST, Ill. (AP) -- The Chicago Bears signed defensive tackle Tommie Harris to a four-year contract extension on Thursday that runs through the 2012 season.

The team declined to release financial terms of the deal, but Harris planned to speak about the new deal during a news conference Friday morning.

The 25-year-old Harris is a three-time Pro Bowl selection. He started 56 of his 60 career NFL games and recorded 208 tackles during his four seasons with the Bears.

A 2004 first-round pick out of Oklahoma, Harris has had 13 sacks in the last two seasons - ranking him second among NFL defensive tackles.

As the prepare for next month's training camp, middle linebacker Brian Urlacher and return man Devin Hester still have unsettled contract situations.