Quoted by The Scottish Sun, Joe Ledley has raved about Celtic fans and reflected on Wales' historic win over Russia in Euro 2016 this week.
The Welsh secured their spot in the last 16 of the European Championships on Monday by thumping Russia 3-0 to win Group B and progress into the knockout phase of a major tournament for the first time ever.
The 29-year-old has seen some glorious nights as a footballer but Ledley says that ranks among them.
Another special win for the Wales midfielder was Celtic's 2-1 victory over Barcelona at Parkead in the Champions League four years ago.
The former Bhoy says the atmosphere created by Celtic fans that night was "just frightening", before noting that Hoops supporters are perhaps the world's finest.
“The Celtic fans are some of the best in the world and they made it a special night," he said via The Scottish Sun. “We beat them 2-1 at Celtic Park and the atmosphere was just frightening.
“I’ll never forget that night because it’ll stay in history with myself and the club. But to be here with my nation, winning the group and going into the last 16, means just that little bit more.”
Celtic fans will be hoping new manager Brendan Rodgers can lead the club back into the Champions League following a two-year absence.
Failure to reach the group stages would not be an ideal start to his 12-month rolling contract. Then again, it might well still be Deila's team effectively ahead of their second-round qualifier with Flora Tallinn or Lincoln Red Imps.