England footie legend Gary launched a scathing assessment of the potential PM as the leading contender finally officially launched his bid for Number 10.
Johnson is the overwhelming favourite with the bookies to replace Theresa May after she resigned amid paraliamentary paralysis over Brexit.
Writing on Twitter, Lineker wrote: "Surely it should be backstabber Boris. Missed a trick here."
He was referencing the slogan rolled out by the former Mayor or London – which is simply "Back Boris".
The controversial Tory MP set out his stall to be leader as he promised to finally deliver Brexit by October 31.
'BACKSTABBER': Gary Lineker slammed Boris Johnson on Twitter (Pic: GETTY)
“Surely it should be backstabber Boris. Missed a trick here.”
The former foreign secretary insisted that it is essential that Britain finally leaves the EU at the end of October to prevent the mood of "disillusion, even despair" in the country from spreading.
Shortly after Mr Johnson began speaking, heckling from the street outside the venue was audible in the room.
Cries of "Bollocks to " and "No to Brexit" could be heard during Mr Johnson's launch speech.
Johnson warned failure that to honour the referendum vote risked handing power to Jeremy Corbyn and Labour at the next general election.
His launch took place as a cross-party alliance of MPs prepared a fresh attempt to use Commons procedure to block a no-deal Brexit.
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'WE MUST LEAVE': Boris Johnson has promised to make sure Britain leave the EU on October 31 (Pic: GETTY)
Johnson said: "After three years and two missed deadlines, we must leave the EU on October 31."
"Delay means defeat. Delay means Corbyn. Kick the can and we kick the bucket."
He added: "We cannot ignore the morass at Westminster where parties have entered a yellow box junction, unable to move forward or back, while around the country there is a mood of disillusion, even despair, at our ability to get things done.
"The longer it goes on, the worst the risk that there will be serious contamination and loss of confidence, because the people of this country deserve the best from their leader."
SLAMMED: Gary Lineker called Boris Johnson a backstabber on Twitter (Pic: TWITTER/GARY LINEKER)
Leading bookies Coral have placed curreny foriegn secretary Jeremy Hunt as the most likely to challenge Boris.
Former leadership contender Andrea Leadsom comes in third, while Michael Gove have slipped back into fourth place after admitting taking cocaine.
Outsiders include social media eccentric Rory Stewart, former Brexit secretary Dominic Raab, and home secretary Sajid Javid.
And with flagging odds are former TV presenter Esther Mcvey, health secretary Matthew Hancock and chartered accountant Mark Harper.
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