It comes following weeks of speculation that saw north London rivals Tottenham attempt to hijack the move at one point. He will sign a five-year deal and will spend the coming season back on loan with Saint-Etienne.
Arsenal have already signed 18-year-old Brazilian forward Gabriel Martinelli and are chasing deals for, Wilfried Zaha, Everton Soares and Kieran Tierney.
Saliba will be the first signing to be completed under new technical director Edu, who was brought in by the club to oversee all first-team action, including the recruitment of new players.
And while Nicholas does highlight the jump in class he also believes that the 22-year-old will be a vast improvement on what Arsenal already have.
Trump slams ‘liberal paper straws’ as his campaign sells expensive plastic ones
The official 2020 Trump/Pence campaign website is selling a 10 pack of straws for $15 as "liberal paper straws don't work". Starbucks plans to eliminate plastic straws at its stores globally by 2020 .
Prosecutors in Mexico say Bakersfield businessman Jose Arredondo was 'beaten to death'
Arredondo was a well-respected member of the Bakersfield community who immigrated to the United States from Mexico in the 1970s. Arredondo's famous son, Samuel Kim Arredondo - also known as "Punch" - has not spoken publicly of his father's tragic death.
I think we are favourites against Sri Lanka, says Bangladesh's Mosaddek Hossain
Bangladesh, however, had a poor show in the World Cup with only Shakib Al Hasan rising up to the occasion. Another cricketer, Taijul Islam, now in Bangalore with BCB XI, will fly to the island nation on July 23.
Celtic manager Neil Lennon has reportedly admitted that his star left-back Kieran Tierney is similar to former Manchester United superstar Cristiano Ronaldo and stated that he would like to keep hold of the Scotsman despite the fact that Arsenal is interested in his signature.
His arrival suggests the Scottish champions are preparing for life after Tierney with Arsenal's interest still strong.
But the deal did not seem to make any progress and Sky Sports have been claiming that the Bhoys are not happy with the offer since they want more cash upfront in exchange of Kieran Tierney.
Earlier, Arsenal captain and French defender Laurent Koscielny gave manager Unai Emery a bit of trouble in the pre-season, by refusing to train with his teammates in the U.S. before the 2019-20 campaign.
And as well as tuning into Sky Sports News, don't miss a thing with our dedicated Transfer Centre blog.