The Redskins will send a fifth-round pick to the 49ers, according to a source.
The Redskins lost their starting tight end, Niles Paul, to a season-ending ankle injury in their preseason opener Aug. 13. Backup Logan Paulsen also is lost for the year with a toe injury, and their top pass catcher at the position, Jordan Reed, has durability issues, having missed a combined 12 games his first two years with injuries.
Carrier is a former college receiver at Division III Beloit and spent two years on practice squads before sticking with San Francisco. He caught nine passes for 105 yards last season and is considered more of a pass catcher than a blocker. He can also help on special teams.
Carrier is the third tight end acquired by Washington in the last week. The Redskins also could use offensive lineman Tom Compton as a tight end in some packages.