Puncheon lashed out on Twitter after Warnock, who briefly coached him at Queens Park Rangers, questioned why he had been allowed to take a penalty that he blazed wide during a Premier League game at Tottenham Hotspur in January.

"Crystal Palace's Jason Puncheon has been fined �15,000 and warned as to his future conduct after he admitted an FA charge for Twitter comments he made in relation to Neil Warnock," read a statement on the FA website.

The FA explained that Puncheon had "failed to act in the best interests of the game and/or acted in a manner which was improper and/or used abusive and/or insulting words".

Speaking after Puncheon sliced his penalty badly wide in Palace's 2-0 defeat at Spurs, Warnock told talkSPORT radio: "There's no way I would've trusted him with a penalty. You've got to have somebody a little bit more cool, and he's not like that, Jason.

"He can whack a 35-yard free-kick in here and there, but a penalty, with all the pressure on him at a place like White Hart Lane, not in a million years for me."

Puncheon responded on Twitter by publishing a series of potentially libellous accusations about Warnock, who subsequently released a statement to say that he had done "nothing untoward".