Sources: Michael Crabtree to Raiders

— -- Michael Crabtree will try to salvage his NFL career by remaining in the San Francisco Bay Area, but by switching teams.

According to three NFL sources, the wide receiver has agreed to terms with the Oakland Raiders. He was the No. 10 overall pick of the 2009 draft.

Crabtree's production waned last season and he appeared to lose explosion from a 2013 Achilles injury. Crabtree has had just two 100-yard receiving games in the 24 games since he return from his injury. Crabtree's highest yardage total in 2014 was 85 yards and averaged 10.3 yards a reception on 68 catches in 2014.

Crabtree has a chance to be a starter for Oakland, which baldy needs receiving weapons for second-year quarterback Derek Carr. The Raiders tried to sign big-ticket free agents Randall Cobb (Green Bay) and Jeremy Maclin (Kansas City) early in free agency. Yet, they are settling for Crabtree nearly five weeks into free agency.

The Raiders could still take either Alabama receiver Amari Cooper or West Virginia receiver Kevin White with the No. 4 overall pick in the April 30 draft.

The 49ers' first-round pick in 2009 (No. 10 overall), Crabtree endured a particularly frustrating season in 2014, even as he played in all 16 games while dealing with nagging foot injuries.

Because even after saving a game for the Niners with a 51-yard catch on 4th-and-10 late at New Orleans, he derisively referred to himself as a third-down receiver or a fourth option. And after entering the season with a 12.9 yards-per-catch career average, he averaged a career-low 10.3 yards per catch, which would have been 9.7 yards sans the 51 yarder at the Superdome.

Crabtree, who missed most of 2013 with an Achilles injury, did catch four touchdown passes, the third-highest single-season total of his career, so he did show some burst. And according to Pro Football Focus, the 49ers' passer rating when targeting Crabtree of 91.1 was third-best on the team, behind Anquan Boldin (103.5) and Stevie Johnson (102.0).

Crabtree, 27, was extremely non-committal about returning at the end of the season.

ESPN.com 49ers reporter Paul Gutierrez contributed to this report.