By Sean Walsh Manchester United tried to cover up the severity of the injury sustained by Leny Yoro in part not to weaken their negotiating stance with Bayern Munich over Matthijs de Ligt, according to a report. Yoro picked up a foot problem only two games into his first pre-season with United after joining on an initial £52.2m deal from Lille. The 18-year-old only missed a single game through injury with Lille last year, but is expected to spend three months on the sidelines with a fractured metatarsal and will not make his competitive Red Devils debut until the autumn. According to The Athle…