Callum McGregor opted to give his full focus to Celtic earlier this month after retiring from international duty with Scotland. The 31-year-old made 63 appearances for the national side and featured at two major tournaments. However, he has since informed Steve Clarke of his wish to be no longer available for selection for his country. Ultimately, the decision makes sense for Celtic. McGregor endured injury problems last season that threatened to end his season prematurely, so it is only right he does what feels right for his body while still in the prime of his career. Despite being a constan…