It could be about to get a lot more difficult for Aston Villa to sign one of their key transfer targets this summer. It looks set to be a busy summer at Villa Park, with signings needed in order to improve both the quality and depth of the squad ahead of the Champions League next season. This won’t be easy, with Premier League spending rules meaning Aston Villa may have to sell one or two important players in order to avoid breaching PSR. Douglas Luiz looks the most likely departure, with talk of a move to Juventus gaining real momentum but he may not be the only player that leaves for a sizea…