By Tom Gott Bayern Munich sporting director Max Eberl has lashed out at the rising costs of transfers in the modern game, insisting Kylian Mbappe’s move to Real Madrid could be the “nail in the coffin”. Mbappe joined Madrid on what was officially a free transfer from Paris Saint-Germain this summer but, on top of a sizeable wage packet, the Frenchman is also understood to have agreed a signing-on fee of €150m. News of the agreement with Mbappe came as a huge shock to Eberl, who insisted it does nothing but damage the transfer market even further. “The money is leaving the market,” he told Sudd…