Jhon Duran’s big-money move to Chelsea has hit a potential stumbling block after an alarming issue has emerged from Aston Villa. The summer transfer window is underway with plenty of deals set to happen over the coming weeks. There is no doubt that Unai Emery and Monchi will be looking to do everything in their power to upgrade Villa’s first team ahead of their upcoming Champions League campaign. Douglas Luiz is already rumoured to leave Villa Park with Weston McKennie and Samuel Iling-Junior coming the other way. Another potential departure is striker Jhon Duran who has been linked heavily wi…