It’s well-documented at this stage that Celtic need a transfer refresh in several positions this summer, regardless of what happens in the current title race. This season could end up being a very successful one for the Bhoys. Brendan Rodgers’ team are pushing for a league and cup double – for many, they are favourites to achieve just that. It remains true, however, that this group are yet to reach their full potential and a few key additions in the upcoming transfer window will help Celtic push on again with new ambitions. One area that definitely needs a purchase is between the sticks given …