• HMRC case thought to be focusing on payments made to agents • Deals for Demba Ba, Papiss Cissé and Sylvain Marveaux also looked at The investigation into suspected £5m income tax fraud in football is focusing on payments relating to five players’ transfers to Newcastle United, including those of Moussa Sissoko, Papiss Cissé, Demba Ba and Sylvain Marveaux, according to sources close to the investigation. HM Revenue and Customs, which conducted an extensive raid on Newcastle’s and West Ham…