Warnock has until the 4th of April to answer the charge, although he has already publicly admitted to it.
"I won't deny that I flipped my fingers in his direction, but only because I was so disgusted and frustrated at being humiliated by a fellow manager," he admitted to the Yorkshire Evening Post. "I held out my hand for six or seven seconds, but he kept on talking and talking and turned his back. There was no mix-up, he even looked me in the eyes."
Worthington, who will unsurprisingly not face charges, has played down the incident, declaring himself 'not bothered'.