The Scottish Premiership side are just one round away from reaching the group-stages.
Celtic's Saidy Janko
While pieces of knowledge about their Champions League opponents would have surely been scarce inside the Celtic dressing room, Saidy Janko has explained to The Scottish Sun that he and his teammates have been handed a warning by Nir Bitton ahead of their play-off round tie with Hapoel Be'er Sheva.
The midfielder came up against the Israeli side during his time with former club Ashdod. And while many Hoops supporters will be confident that the only team standing between them and the group-stages of the competition should not pose them too many problems, Janko has disclosed how Bitton had prepared them for a difficult game.
Nir Bitton has some experience of coming up against the Hoops' Champions League opponents
"I asked Nir Bitton already and he said they are a really good side so we need to be ready," he told The Scottish Sun.
"I heard they're going to be a tough team."
Celtic manager Brendan Rodgers
After the incredible defeat to minnows Lincoln Red Imps in the first game of their Champions League journey, Brendan Rodgers will be reminding his players that assuming that they will be taking their place in the hat alongside Europe's elite could be a hugely costly strategy.
As well as being champions of their domestic league, Hapoel knocked Olympiakos out in the previous round, while not conceding a single goal in either leg, so are clearly capable of causing an upset.
But with Bitton telling his teammates that they must not expect an easy game, and with the defeat to Lincoln not that far in the distant past, it seems likely that complacency will not be an issue for the Bhoys.