#4 David Alaba
Alaba is one of the best defenders in the world because of his versatility. The Austrian international can play as a centre-back or in the midfield and also in his more natural position as a left-back, and the Blaugrana have been admirers of the 25-year-old for a long time.
Alaba has made 287 appearances for Bayern Munich, and is excellent in possession with good dribbling and passing abilities. He possesses blistering pace and can turn defense into attack in a split second. Defensively, he is composed at the back and can make beautiful crosses into the box. Further, he also shows a lot of maturity for a 25-year-old.
His versatility will offer a lot of options for Valverde at the back. Lucas Digne has struggled this campaign and Alaba can help reduce the workload of Jordi Alba. All in all, he will most certainly improve the quality of this Barcelona squad.