Wilkins, 57, has been fighting the chronic bowel disease ulcerative colitis since 1990 along with periodic bouts of depression.
"I need to control the ulcerative colitis with strict medication, which I had not done before the Liverpool game," he told the Daily Mail. "That is the reason I didn't return to the dug-out after half-time as I needed to be close to a toilet.
"Unfortunately I can look the worse for wear but it is nothing to do with drink. I did have verbals with Brendan Rodgers, but it was nothing.
"I was face to face with (Fulham) chief executive Alistair Mackintosh and the owner Mr Khan straight before the game. And if I had been unable to carry out my duties, they had the right to sack me on the spot. I most certainly hadn't been drinking on the train before the match."
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