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Big-hitting Roy was one of the stars of England's victorious World Cup campaign but has previously been overlooked for Test cricket due to concerns his attacking style is better suited to shorter forms of the game.
"We couldn't be better placed in many ways".
"We've taken a huge amount of confidence from the World Cup and that counts for a lot".
"It's something we must capitalise on going into a huge six Tests".
"We knew that after such an emotional final in particular, it was important to get our heads around what was to come", added Root.
Preview:England captain Joe Root won the toss and made a decision to bat against Ireland in a one-off Test at Lord's.
"The last thing we want is him carrying a niggle into a series".
'I hope he doesn't try to play any differently, ' insisted the England captain.
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Root, England's red ball captain, has demanded his players refocus their minds on the gruelling second-half of the summer knowing that victory over Ireland will set the stage for Australia.
England skipper Joe Root is the highest-ranked batsman on either side in sixth place while Jonny Bairstow and Jos Buttler are placed at the 26th and 27th spots, respectively.
"He has shown he can perform in worldwide cricket, his record is good for Sussex with the red ball", Root said. Only in small pockets, but we've seen throughout the World Cup that he can soak up pressure and trust his defence. "Test cricket is Test cricket, it's going to be tough going".
Eoin Morgan, their victorious Dublin-born captain, no longer plays Test cricket with Joe Root, a fellow World Cup victor, in charge.
Ireland will be playing their third Test since making their bow in the longest format of the game past year.
England have won the toss and opted to bat first.
Since the turn of the century, Ireland have become known for their one-day exploits, beating the likes of Pakistan (2007) and England (2011) at World Cups.
"It's any game of cricket", he said. "You take names, reputation, everything out of it", he said. The match is being played over four days rather than the standard five for a Test match.