What's the story?Barcelona have completed the signing of Real Betis left-back Junior Firpo for an initial fee of €18 million with an additional €12 million in variables. The 22-year-old defender joins Barca on a five-year deal. In case you didn't know...The former Real Betis player made his senior debut in 2018 and went on to make 14 La Liga appearances in the 2017-18 season. In the following season, the 22-year-old cemented his place in the starting XI and featured regularly for Betis.Last season, the full-back scored three goals and contributed four assists in the La Liga. Firpo's performances for Real Betis earnt him a lot of interest from top clubs across Europe, with Barcelona, Manchester United and Liverpool all keeping a close eye on the 22-year-old.The young left-back was also the part of the Spain U-21 squad which lifted the U-21 European Championship this year.The heart of the matterBarcelona have finally completed the signing of left-back Junior Firpo from Real Betis for an initial fee of €18 million, which rises up to €30 million including variables. The 22-year-old will sign a five-year contract, keeping him at the club till June 30, 2024. The Blaugrana have also added an incredible €200 million release clause in his contract.Firpo had a €50 million release clause in his contract with Real Betis. However, the Blaugrana managed to get their man at a lower than expected fee. Barcelona needed a back-up for Jordi Alba and have been tracking Junior Firpo from the beginning of the transfer window. The full-back will be joining the likes of Frenkie de Jong, Neto and Antoine Griezmann as new arrivals of the club.👋 Welcome @JuniorFirpo03! 🔵🔴 #ReadyToColor pic.twitter.com/VuIR4yenXz— FC Barcelona (@FCBarcelona) August 4, 2019What's next?The transfer window doesn't end until early September for La Liga clubs. Hence, Barca can make a few more additions to strengthen their squad for the upcoming season. Barcelona will face Arsenal for the Joan Gamper Trophy later today.