Redskins tight end Jordan Reed will be active for the first time since Oct. 4 against the Eagles. (Toni L. Sandys/ The Washington Post)

Tight end Jordan Reed and left tackle Trent Williams both have received clearance to play on Sunday after being in the NFL’s concussion monitoring program, a person with knowledge of the situation said Thursday.

Reed has missed the last two games with a concussion, while Williams missed one game.

Both went through practice in limited capacities Wednesday and Thursday, and both received clearance from the independent neurologist late Thursday.

The absences of both players left huge voids on Washington’s offense. Reed leads the team in receiving and serves as quarterback Kirk Cousins’s go-to guy on third downs; eighteen of Reed’s 24 catches have produced first downs this season.

Williams is the team’s top offensive lineman, both in pass protection and as a run-blocker.