Allen quickly proved worth the hype, earning all-conference and All-American accolades from some publications and breaking Philadelphia Eagles star DeSean Jackson's freshman records for receptions (46) and receiving yards (490) and leading the team with five touchdown catches.
With defenses zeroed in on him in 2011, Allen took his game to another level, snaring 98 passes for 1,343 yards and six scores to earn first-team All-Pac-12 notice. He went down with a knee injury Oct. 27 but had 61 receptions for 737 yards and six touchdowns.
Allen has the physical characteristics to be a No. 1 receiver in the NFL, but few prospects struggled through a more difficult pre-draft period than Allen. The left knee injury that kept him out of the final three games last season has lingered. Allen attempted to work out for scouts in mid-April, but the muscles around the knee weren't fully recovered and he ran a disappointing 4.71 and 4.75 in the 40-yard dash.
That was followed a week later by reports that Allen's drug test at the combine was "red-flagged" and he was ordered to take another test - the results of which weren't known.
Allen, 6-feet-2 and 206 pounds, left as Cal's career receptions leader despite playing fewer than three full seasons. He is expected to run faster once the muscles around the knee are stronger. He has no other known previous off-field issues.
Rarely allows passes to get past his hands and into his chest. Typically snatches passes out of the air, showing very good hand-eye coordination and a wide catching radius due to his length, flexibility and big hands. Tracks the ball easily over the shoulder. Experienced route-runner with extensive experience lining up outside and in the slot. Can slip press coverage. Competitive, attentive downfield blocker.
WEAKNESSES: Lacks elite straight-line speed. Is quicker and more agile than his size would indicate. Doesn't have elite elusiveness and occasionally drops catchable passes in traffic when he heads upfield without the ball.
Missed the final three games of the 2012 season with a left knee injury that sidelined him for the Scouting Combine. Teams will also be very interested in the results of a second drug test at the combine after Allen's first test was reportedly "red-flagged."
Compares To: Jordy Nelson, Packers -- Allen is very similar in that he possesses just enough straight-line speed to beat defenders on the outside. He wins with the size, toughness and sure hands to attack over the middle.