ST. LOUIS (AP) -Trent Green, who ended last season on injured reserve after his second concussion in 13 months, agreed to terms on a three-year contract with the St. Louis Rams on Monday.

In his second stint with the Rams, Green will be the backup behind Marc Bulger. He was supposed to be the starter in 1999 before a preseason knee surgery paved the way for Kurt Warner, who led the Rams to their first Super Bowl victory.

Green visited Rams Park last week and had been mulling a decision whether to keep playing. He replaces Gus Frerotte as Bulger's backup.

``We have now solidified our quarterback position,'' coach Scott Linehan said. ``You will be hard-pressed to find the quality we have at that position.''

Both Green and Bulger have played in two Pro Bowls.

Green was released by the Dolphins last month. He played for the Kansas City Chiefs from 2001-06, starting every game the first five seasons and the first game of 2006 for a franchise-record 81-game streak.