He played college football for the Indiana Hoosiers and was selected by the Los Angeles Chargers in the third round of the 2017 NFL draft.

[7] Ahead of his redshirt junior season in 2015, Feeney was named to the Lombardi Award and Outland Trophy watch lists.

[16] He was ranked the second best offensive guard prospect in the draft by NFLDraftScout.com, ESPN, and NFL analyst Mike Mayock.

[23] He competed with Lamp, Matt Slauson, Brett Boyko, Donavon Clark, and Kenny Wiggins throughout training camp for a starting guard position.

Head coach Anthony Lynn named Feeney as the back-up right guard to Wiggins, after Lamp tore his ACL and was placed on injured reserve for the season.

[24] He made his professional regular season debut during the Chargers' season-opening game, which was a 21–24 loss to the Denver Broncos.

On October 29, Feeney earned his first career start at left guard during a 13–21 loss to the New England Patriots after the starter, Slauson, suffered a season-ending biceps injury.

[25] Dan ended up starting the rest of the season at left guard, being named to the PFWA All-Rookie Team for his efforts.