Celtic boss Brendan Rodgers has endured mixed fortunes regarding the impact his signings have made since arriving at Parkhead over the last two windows. From the summer, Luis Palma has probably become the most noticeable constant, though the Honduran winger has been in and out of his starting line-up for a few weeks now. Paulo Bernardo and Hyunjung Yang have shown glimpses of their abilities; however, few have hit the nail on the head consistently enough in green and white. In the lead-up to the mid-season market, Rodgers called for ‘quality’ additions to walk through the door on several occas…