On 11 January, 32-year-old Whittingham will have been with the Bluebirds a decade, but his latest deal in the Welsh capital runs out in the summer.
It looks certain Whittingham will commit his future to the Bluebirds by signing a new contract.
"We'll talk about that before the FA Cup probably," said Warnock.
Cardiff face Fulham in the third round of the FA Cup on Sunday, 8 December, but before that, on Monday 2 January, the Bluebirds entertain Whittingham's former club, Aston Villa in the Championship.
Back in 2007, then-Cardiff boss Dave Jones, bought Whittingham from Villa for a fee of £350,000.
Since then, the dead-ball specialist has established himself as one of the most popular players ever to pull on a Cardiff shirt.
He has been named in the Championship Team of the Season three times and, in 2015, he was included in the Football League Team of the Decade.
Whittingham also finished joint-top scorer in the Championship in the 2009-10 campaign having found the net 20 times in the league for the Bluebirds.
During his time with Cardiff, Whittingham has turned down the chance of a move away from the Welsh club.
This season he is currently the club's joint-top scorer in the league having found the net five times so far.
But despite that, Warnock says he will not be rushed into a new contract to keep the midfielder.
"That's the least of my worries at the minute. I haven't sorted my own [contract] out yet, let alone Peter's," joked Warnock.
"Peter knows, I've said to him, 'you'll be here as long as me Peter' and he laughed and said, I know, that's what worries me.
"No, we've got a few days [before the Fulham game] then we've got no league points to worry about so we'll probably have a chat during that period."

Some residents of James Turner Street in Birmingham complained that they had been misled before appearing on the programme.
Producers of the reality television show have denied that.
Now, one charity which accused the makers of misrepresenting residents has offered a solution: a self-defence kit against unwanted advances.
Oasis, a community and education charity, runs the primary school in Birmingham where Benefits Street was filmed.
Reverend Steve Chalke, who founded Oasis, said that other communities have approached them asking for advice on what to do if they get attention from reality TV producers.
He said: "We can't proactively defend every community in the country.
"However, we believe that the new self-defence kit will give people the chance to benefit from what we've learnt."
The kit, which is on its website, contains advice on how to discourage television producers.
It also has what it calls a "decoder" to translate what a producer might really mean if they describe the programme they want to make.
Despite more than 900 complaints, watchdog Ofcom ruled that Channel 4 did not breach the broadcasting code.
A second series is thought to be under way in Teesside.
A Channel 4 spokesperson said: "We are always transparent and clear with residents in the extensive briefings that are given pre-filming and operate highly robust duty of care protocols for contributors which were praised by the regulator Ofcom as 'demonstrating best practice'.
"Filming of the second series recently began in Stockton-On-Tees, many months after transmission of the first and the subsequent media reaction, so residents were already familiar with the nature and profile of the programme.
"The majority of them have been happy to co-operate and support filming, even in the face of external pressure put on them by vested interests outside of the street."
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Cardiff City boss Neil Warnock has confirmed the club will start discussing a new contract for midfielder Peter Whittingham.
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Despite being a ratings winner for Channel 4, Benefits Street came with its fair share of complaints.