He committed to play college football at the University of Arkansas, the same school his brother, Brandon, was attending.

[1] After redshirting his first year at Arkansas in 2013, Allen appeared in fives games in 2014 as a backup to his brother, Brandon.

[2][3][4] Allen finished his first starting year with the Razorbacks with a 7–5 record under Coach Bret Bielema.

Allen signed with the Tampa Bay Buccaneers as an undrafted free agent on April 30, 2018.

[9] On November 27, he was selected by the Salt Lake Stallions in the third round during the inaugural AAF “Protect or Pick” Quarterback Draft.