The 23-year-old defender left Sevilla and joined Barca after he paid his €35.9 million release clause.
The 18-year-old defender, who has made only five Ligue 2 appearances, was described as "an exciting prospect" by sporting director Monchi.
Ajaccio have escaped dismissal from the playoffs for promotion to Ligue 1 but will be deprived of home advantage for the first leg of the final.
Friday's Ligue 2 playoff clash between Ajaccio and Le Havre was postponed after supporters of the Corsican club attacked the visiting team's bus.
Stade de Reims secured the Ligue 2 title and a return to the French top flight after beating Ajaccio 1-0 on Friday night.
France's Sports Minister has given the go-ahead for safe standing areas to be tested in French football next season.
French second-division club Le Havre will wear a black shirt for their next two games in remembrance of defender Samba Diop, who died on Friday.
French club Le Havre have said teenage defender Samba Diop has died of unknown causes.
Angry fans of second division French side Le Havre spilled onto the field following a 2-0 home defeat to struggling Quevilly on Friday.
Pierre-Yves Polomat and Michael Barreto were dismissed nine minutes from the end of Auxerre's 4-1 defeat at Quevilly Rouen.
Two Auxerre players face a potentially disciplinary meeting with the French club after fighting each other during a league match.
Tours midfielder Thomas Rodriguez has died at age 18, the French club announced on Friday.
New York City FC completed the singing of Benin international center-back Cedric Hountondji on Thursday.
Atletico Madrid have sold their share in Ligue 2 side Lens just 12 months after making the investment.
Loic Frey said the France international had told him he wanted to return to his homeland before retiring.
Lens goalkeeper Nicolas Douchez was taken into police custody on Thursday for suspected drunken violence against a girlfriend.
Ahead of the French second tier kick-off this weekend, KweséESPN profile five top African talents to watch this season.
Ajaccio will remain in Ligue 2 after successfully appealing against a decision to relegate them on financial grounds.
Konate, a France youth international, has signed a deal until 2022, Leipzig announced on their official website.
Troyes won promotion to Ligue 1 by successfully defending a first-leg lead in their relegation playoff with Lorient.
Benjamin Nivet lashed home a dramatic last-minute winner as Ligue 2 Troyes seized the upper hand in the first leg of their playoff clash with Lorient.
Strasbourg and Amiens were promoted to Ligue 1 on Friday following an incredibly tight race in the French second division.
Amiens SC are on the verge of finally making the jump to Ligue 1 and hope their momentum makes the new French president, a native son, a supporter.
Arsenal have played down reports that they exploited a loophole in transfer dealings to secure the signing of two promising youngsters from Lens.
Arsenal midfielder Ismael Bennacer has been sent on loan to Tours, the former club of Gunners teammates Olivier Giroud and Laurent Koscielny.