Mikel Arteta conceded that Ben White ’s injury “doesn’t look good” with the Arsenal defender’s chances of travelling to the World Cup perhaps now in doubt. White was helped off during the first half of Arsenal’s 1-0 win at West Ham on Sunday after suffering what appeared to be a knee injury in a tackle on Crysencio Summerville. The right-back was in obvious discomfort, grimacing as a member of the medical staff helped him to the sideline, and was later spotted wearing a knee brace as he departed the ground. “We don't know but it doesn't look good at all," Arteta said of the injury. "He needs some further testing tomorrow probably and then we will know." The Arsenal manager also suggested that Riccardo Calafiori had also picked up an issue during the game. The Italian was replaced at half time as Arteta twice reshuffled his backline, first moving Declan Rice to the right side of the back four before introducing Cristhian Mosquera after Calafiori’s withdrawal.…