The highly-rated Frenchman, who has scored nine goals in 21 appearances for Reims in Ligue 1, will cost around £13million.
Newcastle had agreed a £12million deal for the French forward on deadline day in January but the transfer fell through as the player opted not to make the switch to the Premier League.
The Magpies are expected to be busy this summer after being bought by a Saudi-backed consortium in October, with Eddie Howe thought to be prioritising a striker.
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