The future of Rangers captain James Tavernier looked to have been settled when the transfer window slammed shut on August 30th. But after a snarling supporter launched an astonishing rant at the Rangers skipper following the 3-0 humbling at the hands of Celtic, Tav’s future is once again the centre of discussion. HITC transfer guru Graeme Bailey has suggested that clubs in Qatar and Turkey had been alerted to Tavernier’s availability following the circulation of the clip online. The same source claimed that Rangers could target Republic of Ireland full-back Cyrus Christie as a free-agent repla…