Celtic are probing the market for a new goalkeeper and it isn’t surprising that several names have been mentioned as potential successors to Joe Hart. Filtering through links, the most prominently referenced individuals mentioned appear to be Newcastle United veteran Martin Dubravka and Sparta Prague’s Peter Vindahl Jensen. Aston Villa stopper Viljami Sinisalo is also said to be on Celtic’s radar, representing a younger option between the sticks. Liverpool’s Caoimhin Kelleher has frequently been floated as an individual who holds admiration in Parkhead corridors. Despite this, his £25 million …