One of the major frustrations for Celtic this season has been the inability to keep Cameron Carter-Vickers consistently fit and in the team. Even when he has returned to full group training at Lennoxtown he’s encountered little setbacks here and there, forcing him out of the team or prompting another round of scans and injury worries. The latest came last week when the United States international had to sit out the Scottish Cup game at home to Livingston. With the defender now expected to be back in the line-up for today’s clash against St Johnstone, manager Brendan Rodgers has provided more c…