Celtic centre-half Cameron Carter-Vickers has admitted it has been difficult to get all their summer signings "on the same script" but expressed confidence in their squad despite three damaging defeats in a row that have called into question the future of manager Martin O'Neill. The 74-year-old veteran team boss wondered if it is time "to wrap it up" as he headed into the international break pondering his position at the Scottish Premiership leaders following Sunday's 1-0 defeat by Rangers.