Celtic are firmly into the first international break of the season, and there is some time to rest before the schedule intensifies on the other side. Bhoys captain Callum McGregor is enjoying post-Scotland life after announcing his retirement after conversations with Steve Clarke. The 31-year-old has started the campaign in startling form for Celtic, scoring three long-range strikes in his opening four Scottish Premiership matches. Others have travelled to participate in various qualifiers or friendly matches with their respective countries. Liam Scales, Cameron Carter-Vickers, Adam Idah, and …