Leicester's Watson replaces the injured Ollie Hassell-Collins on the wing in the only change to the starting XV that beat Italy in round two.
Vice-captain Courtney Lawes is set for his first England appearance since July having been named on the bench.
Ben Curry is also a replacement after being called into the squad when brother Tom was injured.
With the experienced Jonny May and Jack Nowell left out of new head coach Steve Borthwick's original Six Nations squad, Hassell-Collins led the way for a new generation to shine.