SANTA CLARA, Calif. — Receiver Isaac Bruce formally signed his two-year contract with the San Francisco 49ers yesterday, four days after agreeing to continue his 14-year career with the St. Louis Rams' longtime division rival.

Bruce, who trails only Jerry Rice and Tim Brown in career receiving yardage, could be the 49ers' No. 1 receiver next season under offensive coordinator Mike Martz, the longtime architect of the Rams offense.

"I have a lot left. If that wasn't the case, I wouldn't be here in San Francisco," said Bruce, a four-time Pro Bowl selection. "I haven't really thought about football for the last two months. I haven't set my goals yet. My hopes are very high. I'm going to set my goals very high, and I believe I will attain them."

Bruce is sixth in league history with 942 receptions. He has had eight 1,000-yard seasons, and he caught the winning touchdown pass from Kurt Warner in the Rams' Super Bowl victory over the Tennessee Titans in 2000.

The 35-year-old Bruce believes he'll be a good resource for the rest of the Niners' offensive players as they adjust to the high-octane offense favored by Martz, who was hired as the club's sixth offensive coordinator in six seasons last January. Martz is expected to fix the NFL's least effective offense.

"Just watching the Lions play last year, I didn't see too many different things going on," Bruce said of Martz's scheme in 2007 when he ran Detroit's offense. "I saw the offense being very effective, and I was very familiar with what was going on. Maybe guys coming in and asking me what a person may think, or what coach Martz may think in a situation, I believe I will be able to help."