Mason Mount will sit out Manchester United’s pre-season friendly against Leeds as a precautionMason Mount will sit out Manchester United’s pre-season friendly against Leeds at Croke Park after missing training on Monday and Tuesday. Lisandro Martinez joined up with United’s pre-season training camp late on Monday (Adam Davy/PA)Lisandro Martinez joined up with United’s training camp in the Republic of Ireland late on Monday night, the last of the players afforded an extended break following the World Cup to arrive. On Sunday, England internationals Marcus Rashford and Kobbie Mainoo were among nine players to return amid continuing speculation over the former’s future. Unlike several clubs embarking on pre-season tours, United returned to Carrington after each match to continue preparations for the season at their home base. “Champions League football as well, which is where Manchester United, where we should be, but of course it’s not quite as easy as that.