Celtic’s search for a goalkeeper continues, and more than one new stopper may be needed to satiate potential squad changes this summer. Joe Hart’s departure has opened up a void to be filled by a new number one; meanwhile, Benjamin Siegrist has hinted that he could leave Parkhead. There are plenty of compelling options on the market that Celtic have been linked with. Newcastle United veteran Martin Dubravka and Sparta Prague’s Peter Vindahl Jensen appear to be among the frontrunners going by reports. Nevertheless, a list of goalkeepers as long as your arm have also been mentioned as potential …