A 2-0 victory over Sunderland further advanced the Foxes' hopes of winning the Premier League, but also clinched them a guaranteed place in Europe's elite club competition.
Ranieri's exploits have made waves across the world, with Leicester on Monday becoming the first non-Italian side to dominate the front page of newspaper Corriere dello Sport, and Buffon made public his own support.
"Leicester is no more a fairytale, now is reality," the veteran goalkeeper wrote on his Twitter page.
"Welcome in Europe Mr. Claudio Ranieri!"
Time enough, then, for another fairytale clash against the Foxes idol in the Champions League...