There’s been a fair amount of discussion out there about whether or not Celtic fans should be worried at the club’s lack of business in the January transfer window so far. Certainly, the Bhoys need to bring in some quality additions to bolster Brendan Rodgers’ squad and after an underwhelming summer window, the pressure is on the recruitment and negotiating staff to deliver. It’s worth looking back on recent years and taking a look at what kind of business has been done when in this window previously and what it may tell us about what’s ahead. Celtic’s recent January transfer window historyBac…