Celtics are set to address their defensive line today, provided there are no late hitches in their deal involving Sheffield United’s Auston Trusty. The United States international is poised to join the Bhoys for a fee in the region of £6 million, but red tape needs to be cleared before the deadline to ensure he gets his visa sorted in time. Personal terms have been agreed upon, and a five-year deal is on the table for the former Arsenal man, who will be charged with competing against Liam Scales for a slot alongside Cameron Carter-Vickers. Maik Nawrocki could potentially leave Celtic on loan a…