"Tommy was a Celtic great, one of football's greats and I know he will be so sadly missed by everyone who knew him," Celtic chief executive Peter Lawwell said. "He was a man of huge stature in the game."
"It is an intolerable state of affairs which must end," he said. "Celtic, from our inception, has been a club open to all. We enjoy friendship and respect throughout the world yet, here in Scotland, we are caught up in these vile events."