There’s a model they follow and Celtic have had some real success in the transfer window this last decade.
While an academy star like Kieran Tierney has been sold for £25m, the Hoops have also implemented a buy low sell high model effectively. That has a few stars in their current ranks forming the centre of summer rumours this transfer window, with big profits likely en route.
Outside that, a player in Glasgow is judged by their trophy haul in most cases and all of these Celtic players of the present and past can count a fair amount of silverware. They all have made a serious impact in Hoops, whether that be on the park, or what they brought into the club when leaving.
Taking a look over the last 10 years, we take our picks for the 13 best moves in no particular order that Celtic have made in that time.
13. Joe Hart
One of British football's most decorated goalkeepers, Hart won numerous titles with both Celtic and Manchester City - five to be precise. He retired earlier this summer and the reception for him at Parkhead for his final league game tells you all you need to know. | Getty Images