Allen (hamstring) was a limited participant in Thursday's practice.
The Chargers listed Allen as a non-participant in each of their previous four practices, so his limited activity to begin Week 6 would seem to be a promising sign. Even so, Allen may need to upgrade to full activity Friday or Saturday for the Chargers to feel comfortable signing off on him playing Monday against the Broncos after he missed each of the previous four games with the hamstring injury.