Manchester United fans are preparing for the worst after Lisandro Martinez suffered an injury against West Ham. ‘The Butcher’ was unable to continue after sustaining what appeared to be a knee injury in the second half. Lisandro Martinez had attempted to play on for a short period but was in clear pain and went straight down the tunnel with medical staff. MUTV’s Sammy McIlroy told the channel’s commentary that Martinez would only go off if there was something seriously wrong. READ MORE: Confirmed Manchester United transfer deals for January 2024, ins, outs, loan movesErik ten Hag worriedManage…