White was also a member of the Tampa Bay Buccaneers, Atlanta Falcons, Tennessee Titans, New Orleans Saints, Washington Redskins, Chicago Bears, Cologne Centurions, Orlando Predators, Tampa Bay Buccaneers, Minnesota Vikings and Virginia Destroyers.

He led the team with eight tackles-for- loss, five quarterback sacks and five forced fumbles his senior year and earned honorable mention All-Big Ten by both the coaches and media.

In a 13–10 win over the New Orleans Saints, White recorded 4 sacks and 2 forced fumbles[4] in a single game.

[7] In January 2006, White signed a contract to play for the Orlando Predators of the Arena Football League.

[citation needed] White was further enticed to Tampa by defensive coordinator Monte Kiffin, who promised him a real shot at making the roster instead of simply being another (training) "camp body".

[7] After making the cut at training camp, White was instantly thrust into the limelight on the Buccaneers defensive line.

The release of veteran Pro Bowl end Simeon Rice shortly before the start of the pre-season, injuries to free agent acquisition Patrick Chukwurah and the fact that top five 2007 NFL draft pick Gaines Adams was deemed not ready led to White seeing extended playing time on the field.

Starting opposite fellow rookie Adams, he sacked Falcons QB Byron Leftwich twice and forced two fumbles, one of which was returned for a touchdown by Ronde Barber.

After the game, Coach Jon Gruden was quoted as saying: Every time he makes a play, I can hear my brother up in the press box saying: 'I told you so.'

He's raw a little bit in terms of the big picture, but I give a lot of credit to Greg White.

[16] An exclusive-rights free agent in the 2008 offseason, White signed his one-year, $370,000 tender offer on July 26.

White later signed a new three-year, $2.845 million contract on September 15, 2008, with the possibility to earn more money in incentives.

He also finished the year tied for most forced fumbles on the team with 2[20] On August 22, 2011, White signed with the Minnesota Vikings.

[23] At the start of the 2022 NFL season, White began writing a weekly column covering the Buccaneers for the St. Pete Catalyst.

The official Buccaneers website ranks White as the best player in franchise history to wear the number 91.