Los Angeles Chargers undrafted rookie quarterback DJ Uiagalelei had been wearing No. 13 through the first three weeks of training camp, including in the Hall of Fame Game last week. It never quite felt right.

Here are five things to remember about Allen: There's been no receiver in Chargers history with more prolific numbers than Allen. The veteran wide receiver spent the first 11 seasons of his career in the powder blue and owns the franchise records for most receptions (904) and yards (10,530) among Chargers wide receivers.