Oakland Raiders receiver Michael Crabtree has insisted that he has a lot to prove following his move from the San Francisco 49ers this off-season.

Crabtree had just 982 yards in his last two seasons, but is adamant that it was caused by a lack of playing time and injuries stifling his progress.

"I have a lot to prove," Crabtree said, according to the San Francisco Chronicle.

"A lot to prove. Ain't got nothing to lose and have a lot to prove."

Although Crabtree was criticised for a lack of explosiveness last year, he insists that he is excited about starting a new challenge where the coaches want him out on the field.