The 20-year-old signed a five-year deal worth a reported 13 million euros ($14.7 million) after rising through the youth ranks at Ligue 1 club Paris St Germain but earning only limited playing time in just over two years with the senior team.
He was warned, though, to expect fierce competition from existing forwards including Germany international Timo Werner for a starting spot at Leipzig.
"The competition is there but I am confident he can master it," coach Ralph Hasenhuettel told a news conference.
Ambitious Leipzig, owned by energy drinks maker Red Bull, shot through the lower divisions before spectacularly finishing their first Bundesliga season in second place and earning an automatic Champions League group stage spot.
(Reporting by Karolos Grohmann; editing by Clare Lovell)
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