By Sean Walsh John Stones has left quarantine at England’s Euro 2024 base and returned to full training. The defender missed a recent training session due to a stomach bug and had been confined to his bedroom at the Three Lions’ camp to prevent the spread of illness. However, he was able to mingle with teammates again on Thursday and has resumed training ahead of the start of this summer’s European Championships. Despite taking to the grass on the eve of the tournament, there remain doubts over whether Manchester City defender Stones will be fit enough to start England’s opening group stage ga…