Kovalainen told the Finnish newspaper Turun Sanomat he also cannot be sure that McLaren's gamble on Magnussen will pay off.
If the system had already been in place, both Ferrari drivers would have championships: Massa not Hamilton in 2008, and Alonso not Vettel in 2012.
British Formula 1™ driver Lewis Hamilton MBE was awarded the BRDC’s premier annual award, the BRDC Gold Star, for the fourth time.
The team finished the 2013 season with a total of 360 points and a total of three wins, six further podiums and eight pole positions.
Only four drivers have claimed pole position this year – Vettel, his team mate Mark Webber and the Mercedes line-up of Nico Rosberg and Lewis Hamilton.
Qualifying in Sao Paulo for the Brazilian Grand Prix was delayed due to the flooded areas on the Interlagos circuit.
Lewis Hamilton qualified in the top five for the 17th time in 19 races this season.
Toto Wolff: "We had two decent sessions today, which further confirmed the tendency already seen this season that our car performs well in mixed conditions."
Mercedes’ Nico Rosberg on top again at Interlagos as he delivers repeat performance.
Mercedes drivers have a slightly different view on Massa's move to Williams team.
The final race of the 2013 Formula One World Championship takes place at Interlagos in Sao Paulo on Sunday 24 November.
Mercedes boss Ross Brawn also commented on the inconsistency of his driver, Hamilton.
The team scored 14 points and is now 15 points ahead of Ferrari and 33 ahead of Lotus in the Constructors' standings.
Dr Helmut Marko claims that the two Mercedes drivers together cannot equal Vettel.
This afternoon saw Lewis Hamilton and Nico Rosberg qualify in fifth and 14th places respectively for the United States Grand Prix.
Mark Webber stunned the paddock and the Red Bull team by pinching the pole out of the hands of his team mate on the Yas Marina Circuit.
Nico Rosberg and Lewis Hamilton qualified on the second row in third and fourth places for the Abu Dhabi Grand Prix today.
Red Bulls first and second ahead of Mercedes pairing.
Nico Rosberg and Lewis Hamilton completed a total of 125 laps today, equivalent to more than two race distances.