By Dan Marsh Barcelona are mulling over whether or not to sell Frenkie de Jong in the summer amid interest in the midfielder from Manchester United. The Dutch playmaker, 26, was heavily linked with a move to the Red Devils back in the summer of 2022 and it was even outlined at the time that United had agreed the framework of a deal worth £70million with Barcelona for De Jong’s services. De Jong decided to snub interest from the Premier League giants at the time in order to stay at Barcelona – but it seems as though the Spanish champions could attempt to cash in on the former Ajax star for a se…