The Patriots on Thursday signed free agent Bruce Ellington.
Harris had 28 catches for 304 yards and zero touchdowns last season and rushed twice for 10 yards.
In his three years with Washington, Harris has bounced on and off the Redskins active roster and practice squad.
At 6-foot-3, 200 pounds, Harris immediately becomes the tallest member of the Patriots' receiving corps, which lost big-bodied Cordarrelle Patterson in free agency. Harris didn't reach more than 52 yards in any other game, though he did follow up with a solid five-catch outing the following week at Tampa Bay.
Despite his height, Harris frequently lines up in the slot, doing so on 45 percent of his offensive snaps for Washington last season, according to Pro Football Focus. He was an undrafted free agent out of Cal in 2016.
With the Pats, he will reunite with former teammate Stephen Anderson, a backup tight end.
Ellington, 27, helps fill out a depth chart at receiver that includes Julian Edelman, Dorsett, and Braxton Berrios.