Arsenal have announced the signing of Saint-Etienne star William Saliba in a £27million deal.
It is the Gunners' second signing of the day, after completing the loan move of Dani Ceballos earlier. And the 18-year-old defender will return to Saint-Etienne on a season-long loan.
Following the signing, Unai Emery said: 'We're delighted William is joining us. Many teams wanted him but he decided he wanted to come to us and be part of our future.
'He will stay in France next season for more experience and then we look forward to him joining our group.'
Saliba made 16 appearances during his debut campaign after breaking into Saint-Etienne's first-team in late September.