Allen said in an announcement through the school on Wednesday that he is grateful for his time at Cal and feels ready to take the next step to the NFL.
The 6-foot-3 Allen is the 24th overall player on ESPN's Mel Kiper Jr.'s Big Board, and the only wide receiver on the 25-man mock draft.
Allen finishes his career as the school's all-time leader with 205 receptions. He ranks third with 2,570 yards receiving and seventh with 17 touchdown catches.
Allen's best season came as a sophomore when he had 98 receptions for 1,343 yards and six touchdowns. He had 61 catches for 737 yards and six TDs this season before missing the final three games with a left knee injury.
Information from The Associated Press was used in this report.