[3] However, he received little attention as a college recruit due to having suffered a knee injury the year prior, which caused most schools to lose interest.
[6] Collier had an offer to continue his college football career with the NCAA Division I FCS Wagner Seahawks and transferred there in 2020.
[8] He helped Lock Haven to its best season since 1982 and broke the school's all-time single-season rushing yards record, receiving numerous honors including being a nominee for the Harlon Hill Trophy as the best player in the NCAA Division II.
[3][8] Collier impressed at his pro day, with a 4.48-second 40-yard dash and a 6.78 three-cone drill, each being better than any running back at the NFL Scouting Combine.
[3] After going unselected in the 2024 NFL draft, he signed with the Baltimore Ravens as an undrafted free agent, being given a three-year, $2.8 million contract.