"Mohammad Amir is fully fit and available for selection," he told reporters at Nottingham's Trent Bridge.
There had been speculation that the 27-year-old, a late inclusion in the squad, would miss the game for health and fitness reasons after sitting out the last four one day internationals.
Amir produced a match-winning three-wicket haul in the Champions Trophy final in England two years ago after missing the 2011 and 2015 World Cups as a result of a five-year ban for match-fixing.
Sarfaraz said he was clear about his starting 11, with all his players fit.
Pakistan, tournament winners in 1992, arrived in Nottingham on the back of a stunning loss to Afghanistan in a warm-up match in Bristol and 10 straight ODI defeats at the hands of England, Australia and South Africa.
But they are also seen as unpredictable, which Sarfaraz said was only a positive.
"I think it's good to be unpredictable," he added. "At the end of the day, the Pakistan team is very dangerous."
(Reporting by Alan Baldwin in London, editing by Pritha Sarkar)
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