On September 11, 2000, Diggs was named Sports Illustrated's Special Teams Player of the Week by Peter King.

Diggs played in 13 games with 12 starts at strongside linebacker and was named All-Rookie by the PFWA after posting 54 tackles, one fumble recovery and four passes defensed.

In the 2003 off-season Diggs signed a four-year, $10.5 million contract after the Packers matched an offer sheet for the same amount from the Detroit Lions.

[3] In 2003 Diggs moved to weakside linebacker from and started all 16 games and had 123 tackles, 1.0 sack, one forced fumble, two interceptions and eight passes defensed.

Diggs did start 14 games at weakside linebacker had 116 tackles, 1.0 sack, two passes defensed and one blocked kick.

In 2008 Diggs started all 16 contests as the strongside linebacker and recorded 62 tackles, 1.0 sack, one interception, and two passes defensed.

2009 was Diggs's final season with the Panthers and he remained at strongside linebacker and played in 15 games with 11 starts and recorded 42 total tackles and a forced fumble.