Barcelona need to sign a defensive midfielder as a priority in the summer transfer window, and already look set to make an addition in the area. The departure of Sergio Busquets hit Barcelona hard, and they signed experienced midfielder Oriol Romeu on a low-cost transfer from Girona to try and replace him without spending heavily. However, Romeu has been a disappointment since joining Barcelona, and Xavi has had to try other options, including Frenkie De Jong or Andreas Christensen at the base of midfield. Barcelona’s spending power in the summer transfer window may be limited again, and they …