The 18-year-old had caught the attention of both Manchester City and Manchester United, with both in need of defensive reinforcements.
Tottenham are thought to have made a late bid for the defender but the Gunners are the ones who have won the race for his signature.
According to The Sun, Arsenal have beaten them to it and have reached an agreement with the centre-back to bring him to the Emirates on a five-year deal as they seek a replacement for Laurent Koscielny.
The 6ft4in defender has been backed for a bright future and should only get better considering he is only 18-years-old.
Below talkSPORT.com gives an in-depth insight into all you need to know about Saliba…
William Saliba – 2018/19
Age: 18
Club: Saint-Etienne
Position: Defender
Nationality: France
All competition appearances: 19
Starts: 13
Substituted: 3
Yellow cards: 1
Pass success rate: 85.6 per cent
Tackles per game: 2
Interceptions per game: 1.8
Clearances per game: 2.7
Aerial duels won per game: 1.8
Dribbles per game: 0.6
What’s the gossip?
Reports in France claim Arsenal have all-but concluded a deal to sign Saliba on a five-year contract.
The Gunners were among a host of clubs keeping tabs on the defender, with Real Madrid and both Manchester clubs tracking his progress.
Saliba’s representative, Djibril Niang had added fuel to the fire over where he would could be heading next, by uploading an Instagram story of himself inside a bar in Manchester recently.
Club president Bernard Caiazzo confirmed that everything is going through with the Gunners and he will be loaned straight back.
Speaking to Le Progres, Caiazzo said: “Everything is on track with Arsenal.
“William will spend next season with us.”
The French publication also claimed that the clause keeping Saliba at the club next season was considered non-negotiable by the Ligue 1 side.