NFL on ESPN - Todd Gurley will wear No. 21 despite Deion Sanders' efforts to get him to rethink it.
Todd Gurley: Deion Sanders 'hatin' on me' for taking his number
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Is Deion Sanders out of line telling Todd Gurley not to wear No. 21?
The Pat McAfee Show - Pat McAfee, ESPN
In the NFL, how can an offensive player wear a number 90-99 and thus be ineligible receiver? In the rules 90-99 are ineligible numbers, however, the numbers are for defensive players. - Quora
The Pat McAfee Show 2.0, Podcast
Todd Gurley: Falcons running back to wear No. 21, Deion Sanders Says 'It Ain't That Deep' - Sports Illustrated
When Todd Gurley revealed Deion Sanders' attempt to dissuade him from wearing iconic Falcons jersey number-Prime was hatin' on me”