McNamara said: “Brett came very close to being selected in the initial Elite Training Squad back in March.
“Brett has been in outstanding form throughout this campaign and I had no hesitation selecting him. We have always had players coming into form that have received international recognition in the past few years.
“I have always said that if players, who are not necessarily established in the England programme, are playing well they will be considered. Brett deserves his call up and I know he’ll do a job for us.”
From the original Elite Training Squad selected in March, 11 players have not made the final 20, including Widnes forward Gareth Hock, Hull FC’s Tom Briscoe, St Helens forward Jon Wilkin and Wakefield winger Ben Cockayne.
England 20-man squad: Burrow, Charnley, Chase, Crabtree, Cudjoe, Ellis, Farrell, Ferres, Hall, Hardaker, Hill, Jones-Buchanen, Morley, Mossop, Myler, O’Loughlin, Roby, Sinfield, Tomkins, Westwood.