The transfer window is now open and Celtic are set to raid the market for several additions in key areas this summer. Understandably, much has been made of the goalkeeper situation as Brendan Rodgers seeks to find a Joe Hart successor; meanwhile, Paulo Bernardo and Adam Idah are two pursuits the club would like to wrap up on permanent deals. Speculation is rife as Celtic look to make some savvy decisions on the recruitment front, and it is set to be an exciting few months in the market. Options are cropping up daily that could represent compelling business. In light of this, it is time to revi…