Green Bay Packers wide receiver Randall Cobb believes that he hasn't done enough yet to merit a new contract from the club.

The Packers handed a lucrative extension to veteran wideout Jordy Nelson last week, but Cobb – who is entering the final year of his rookie deal – feels that he still has work to do to deserve his payday.

"I don't believe I've done enough and I think that's on me," Cobb told ESPN.

The 23-year-old has recorded 136 receptions for 1,762 yards along with 13 touchdowns in his three seasons with the club.