When it comes to the January transfer window, things might be quiet on the incoming front, but Celtic are ensuring everybody else is kept in-house. Cameron Carter-Vickers has been a crucial player for the club since he arrived in 2021, including proving to be the best defender in Scotland. But Celtic fans received the best news of the January window so far this week when the 26-year-old penned a new contract at Parkhead. Peter Grant shared that he is ‘delighted’ with the news because Cameron Carter-Vickers has been ‘magnificent’, as he told Go Radio. Injuries have frustrated the player in rece…