[1] As a member of the 2009 Michigan Wolverines, he led the team in interceptions, earning first-team All-Big Ten recognition from the media.

However, USC had a lot of depth at cornerback at the time and Warren (as well as his father) had a good relationship with Michigan assistant coach Ron English.

[5] When Warren made Michigan his final decision, he was noted as feeling that his heart wanted him to choose USC, which was the school he had grown up rooting for.

However, his head led him to Michigan where he could play immediately and work under the tutelage of English, who had developed many defensive backs and went on to the National Football League.

[1] That season, he led the Wolverines with four interceptions, which ranked tied for sixth in the Big Ten Conference and 49th in the nation.

[13] At the conclusion of the season, he was selected as to the 2009 All-Big Ten conference team by the media (first-team) and coaches (second-team).

[14] On December 20, 2009, Warren announced his decision to forgo his final season of collegiate eligibility and enter the 2010 NFL draft.

[19] Some sources, such as Todd McShay, who felt he was just a cut below the top five cornerbacks in the draft prior to the 2010 NFL Combine, had predicted that Warren could be selected in the second round.

Gave up some big plays.”[21] Warren aggravated an ankle injury shortly before the NFL Combine, where he struggled in position drills and ran the 40-yard dash in 4.59 seconds.

Warren's godfather, former Pro Bowl defensive back Mark Carrier, is an assistant coach with the Jets.

[24][25] The 2010 New York Jets have several cornerbacks on their roster, including Darrelle Revis, Antonio Cromartie, Dwight Lowery, Drew Coleman, Marquice Cole and first-round pick Kyle Wilson.