The midfielder left the Emirates Stadium for Ligue 1 last summer and impressed enough to earn a £23 million transfer to the French big guns this week.
According to the Evening Standard, the Gunners agreed a 20 per cent sell-on clause as part of the deal that took Reine-Adelaide away from north London last summer.
That means that the Premier League side are set to receive around £5 million from the deal.
Lyon confirmed the €25 million capture of the 21-year-old on a five-year deal on Thursday.
The 21-year-old, who scored three goals in 35 appearances last season for Angers, spent two-and-a-half years with Arsenal’s Under-23 side but struggled to break into the first team.
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