Lenglet, a former France under-21 worldwide, becomes Barca's second signing of the summer following confirmation last week that Gremio midfielder Arthur Melo will also join the club this month.
The Spanish giants were reportedly hoping to pay the fee in instalments, but Sevilla have apparently made it clear they would not enter into talks with Barca.
Parents of Thai cave rescue boy give thanks to God
Adisak Wongsukchan told Al Jazeera he gave his 14-year-old son Nong Bew a big thumbs up when he first saw him in hospital. The Wild Boars football team which were stuck in Tham Luang Nang Non cave for 18 days after monsoon floods.
It has been claimed that Barca have activated the Frenchman's €35 million (R553 million) release clause after Sevilla refused to negotiate with the Blaugrana.
Lenglet, 23, has signed a five-year deal at the Nou Camp after the Spanish champions met his buy-out clause. The deal with Barcelona also includes a €300m release clause.
The French global joined Sevilla from Nancy in January 2017 and scored four goals in 52 games last season.
He becomes the fifth centre-back in Barca's first-team squad, but Thomas Vermaelen, Samuel Umtiti and Yerry Mina have all been the subjects of transfer speculation.
Do you think Lenglet will be a success at Barca if he joins?
Barca also now have Thomas Vermaelen and Yerry Mina vying for a place in the middle of the defence, although one of them is likely to leave before the transfer window closes.
Massive fuel tank explosion rocks Cairo airport
Cairo International was the scene of a terrorist attack in 2015 when a passenger smuggled a bomb on to Metrojet Flight 9268 . A number of local tweets poured in with users claiming to have heard a loud explosion followed by the sounds of ambulances.
Israel To Launch First Moon Mission This Year
Private donations mostly paid for the project, including from the American businessman and Jewish philanthropist Sheldon Adelson. Instead, it will be sent up as a secondary payload atop a SpaceX Falcon 9 rocket on a yet to be determined date in December.
Thai Boys Wave to the World in First Video Since Their Rescue
There were several options as to how to save the boys, including keeping them in the cave until the monsoon season was over . The exact mechanics of the rescue bid were closely guarded during the operation, but details have since dribbled out.
USA threatens to impose fresh tariffs on China
On Wednesday, the Trump administration said ZTE took another step toward ending a us ban after ZTE signed an escrow agreement. The International Monetary Fund has warned that a full-blown trade war could undermine the broadest global upswing in years.