The former Tottenham and Leicester marksman revealed in a History Channel documentary that he was desperate to leave the pitch but didn't want to let his Three Lions team-mates down.
The Match of the Day host had been suffering with a troublesome tummy before the match and had a terrible sense that the worst was yet to come.
But, having bravely refused to dash off the pitch and leave his nation a man down against Ireland in the group clash, he stretched for a ball and lost control of his bowels.
Lineker said: “I had a bit of a dickie stomach, I don’t know where it came from.
“I managed to get through the first half despite terrible stomach cramps.
"You know, it’s a World Cup, you cannot say ‘Excuse me, ref, is it alright if I pop off for five minutes?’
“Anyway, the ball went and I kind of go for it but I stumble a little bit.
"And as I stumbled, I… relaxed.
“I remember Gary Stevens coming up to me and he’s looking over me saying ‘are you alright?’
“And I just remember saying: ‘I’ve s*** myself?' What do you do?"
- History of Football starts on HISTORY from 28th May and lasts for 14 days.
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