A member of Celtic‘s backroom staff required stitches after being hit by a glass bottle during the team’s 2-1 victory against arch-rivals Rangers on Sunday. Celtic have said the staff member, whose name was not disclosed, “required urgent medical treatment and stitches to a head wound” following an incident that took place as players, officials and staff made their way up the tunnel at half-time. Celtic said police were looking into the incident during the Scottish Premiership game at Ibrox. The start of the second half was also delayed while ground staff cleared away broken glass from the penalty area where the Celtic goalkeeper Joe Hart was going to be. “It’s disappointing,” the Celtic manager, Ange Postecoglou, said. “I thought the atmosphere was unbelievable. This is a fixture that gets beamed around the world. You don’t need a couple of idiots.” The former Celtic striker, Chris Sutton tweeted: “Absolute scumbags throwing glass bottles on to the pitch. How low can some people go. This is how this game will be remembered now.” Cameron Carter-Vickers scored the winner from close range in the 43rd minute to complete a comeback victory for Celtic, who lead Rangers by six points in the title race with six games to go.