Slovenia coach Matjaž Kek said that “11 players will not be enough” to face an aggressive Serbia in their second Euro 2024 group stage match on Thursday. “We know that 11 players will not be enough tomorrow because of the high tempo, the aggressiveness. We’re working out how to keep a high tempo for 90 minutes against an opponent like Serbia,” he said at a news conference on Wednesday, inferring substitutes would be key. Slovenia will try to build on a 1-1 draw with Denmark while Serbia, which used to be part of Yugoslavia with the Slovenians, are on the back foot after the opening 1-0 loss to…