Allen didn't practice Wednesday due to a knee injury, Jeff Miller of the Los Angeles Times reports.
Miller speculates that Allen was held out mostly as a precaution, a notion that would be supported by a return to the practice field on the wideout's part -- in any capacity -- come Thursday. In the Chargers' Week 9 win over the Eagles, Allen was on the field for 62 of a possible 69 snaps and caught 12 of his 13 targets for 104 yards. Overall, he's averaging 75 receiving yards on 10.3 targets per game.