In Week 4 of 2014, Allen established a career high of 10 receptions for 135 yards in a 33–14 win over the Jacksonville Jaguars. During week 12 against the Ravens Allen had caught 2 touchdowns and 121 receiving yards contributing to the Chargers win. He missed the last two games of the season after suffering a broken right collarbone against Denver in Week 15. He finished the season with 77 receptions for 783 yards and 4 touchdowns.
UNIVERSITY CALIFORNIA, BERKELY
Allen attended the University of California, Berkeley, where he started at wide receiver for the California Golden Bears football team from 2010 to 2012. Allen left school after his junior season having caught a school-record 205 passes, for 2,570 yards (third in school history) and 17 touchdowns (seventh). It included a career-high 98 catches for 1,343 yards as a sophomore in 2011.