Williams' late call-up to England side
But he has been drafted into the line-up and will make his first appearance of the tournament, after missing out on the 18-4 loss to Australia last week.
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Hide AdIt was unclear who he will replace. Castleford’s Luke Gale and St George Illawarra’s Gareth Widdop were halfbacks for the opening game.
Williams, who made his Test debut in 2015 and also figured in last year’s Four Nations, received his match shirt from former Hull FC and GB forward Gareth Ellis.
The 23-year-old posted a picture on his Instagram account, stating: “Can’t wait to pull the jersey on tomorrow. What dreams are made of to play in the World Cup.”
His Warriors team-mates John Bateman and Sean O’Loughlin were also named in the initial 17-man squad.
It is the first time England have faced Lebanon, who beat France 29-18 on the opening weekend.