Ahead of today's Scottish Cup tie with Partick Thistle, Celtic Park paused to remember Liam Miller, who tragically passed away overnight. He was just 36.
Miller made his breakthrough at Celtic under Martin O'Neill, memorably scoring goals in the Champions League against Lyon and Anderlecht before earning a move to Manchester United. Henrick Larsson was moved to call him "one of the best young talents I have ever seen".
The flags at Celtic Park flew at half-mast today following the news, with Miller remembered during an impeccably-observed minute's silence ahead of kick-off.
Celtic tribute to Liam Miller
Before the game, Celtic and Ireland legend Packie Bonner paid tribute to Miller, and remembered his Celtic career.
A sad day. We remember those goals Liam scored when he broke through, especially in Europe. People will say that he moved too soon, but he couldn't knock it back. It was huge money for him and it was Manchester United.
I remember him breaking into the international team with Brian Kerr - I was part of the coaching staff - and while he was an unassuming young man off the pitch, he was a brilliant young player on it. It's a really, really sad day for his family and everyone connected with him down in Cork.
I was speaking to his mother recently and they were very sad about what was happening to him....and he's gone now.
Martin O'Neill, who gave Miller his senior debut, has also paid his respects.
I remember the impact that Liam had in a big Champions League match against Lyon. We were pressing strongly and trying to find the breakthrough when Liam scored a magical goal that gave us momentum to win the game.
At the end of that season, Liam moved on to Manchester United but had already made a strong mark at Celtic Park and the players were extremely disappointed to see him go.
Liam's passing is very sad and he will be greatly missed. He was an excellent footballer and a fantastic man.