Allen spent most of his career as a backup safety with brief stints as a starter with the Blue Bombers and Rough Riders.
Allen was selected by the Winnipeg Blue Bombers in the fourth round of the 1988 CFL Draft with the 29th overall pick.
[4] Allen recovered three blocked punts for touchdowns throughout the season, including one that was returned 30 yards to the endzone against the Ottawa Rough Riders.
[10][11] In November of that year, Allen again blocked a punt which was recovered by Paul Clatney for a Blue Bombers touchdown.
[12] In addition to his large role on special teams, Allen contributed far more defensively in 1989 than he did in his rookie year, recording 27 tackles in 16 regular season games.
[7] In 1991, Allen started in place of Bovell after he suffered torn knee ligaments early in the regular season.
[22] During a practice in September, Allen fought with fellow Rough Rider defensive back Anthony Drawhorn after the two players insulted each other.
[27][28] While Allen returned quickly from the injury, he was replaced by Walcott as starter and was moved to the reserve list for a short time.
[29][30] He was reactivated after Walcott was injured with turf toe, but Remi Trudel was started at safety in place of Allen.
Shortly afterward, Ottawa traded Allen to the BC Lions for safety Burtland Cummings.