Kenny Dalglish's new book 'My Life: A Personal Journey' touches on all the moments of his celebrated career.
"In 1971 I got a regular place in the first team at Celtic, having played three or four pre-season games and scored a few goals," wrote Dalglish.
"Celtic Park was being renovated because they were putting the new stand up, so we had to play the two games at Ibrox.
"We were winning 1-0 in the first game when somebody went through and got pulled down for a penalty.
"Billy McNeill said to me: 'You take it.' I said: 'Why?' He said: 'You take it. You've taken one for the reserves.'
"I said: 'Oh, there's no difference then? Over 70,000 people and you're comparing it to reserve-team football.'
"It was at the Celtic end and all the photographers ran behind the goal in anticipation.
"Our fans were all cheering, although I think when they saw me stepping up they were saying 'Oh no!' - or words to that effect.
"It was like that moment when Alan Kennedy stepped up in the European Cup Final for Liverpool in Rome to take the final penalty and the rest of us thought 'Oh no!'
"I was nervous to say the least and so knelt down to tie my laces. I finally stood and scored and that was it. I had my first Celtic goal."