After not playing in 2021, Allen posted 22 receptions for 500 yards and four touchdowns as a
freshman at Louisiana Tech in 2022, leading all freshmen nationally with 10 scrimmage plays over 30 yards and ranking second with an average of 22.7 yards per catch. The following season, he caught 46 passes for 778 yards and four touchdowns. Allen transferred to the
Texas A&M Aggies in 2024, having finished his stint at Louisiana Tech with 1,278 receiving yards and eight touchdowns. At Texas A&M, he started five games and was the team's third-leading receiver with 18 catches for 269 yards and a touchdown before suffering a season-ending arm injury. He became the team's leading receiver and finished the season with 51 catches for 674 yards and 13 touchdowns, with his touchdowns leading the
Big 12 Conference while tying the school record. He was invited to the
2026 Senior Bowl at the conclusion of his collegiate career. ==Professional career==