Sebastian Vettel says Ferrari is following its own development plan and expects the 'same old game' of guesswork until his rivals reveal its true potential.

Ferrari has introduced a new turbocharger for the Canadian Grand Prix, while Honda has also spent development tokens on a new turbo and Mercedes and Williams are also running a series of small aerodynamic updates, it opens opportunities of unknown performance gains.

With the upgrade culture a common feature in F1 and heading to the high-speed Circuit Gilles Villeneuve, Vettel has reserved his predictions of gains from both his car and his rivals.

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"You always hear different things - some of it is true, some of it not - but I know what is happening for us," Vettel said. "We have some bits here that we believe in. Obviously, the bits we've brought here weren't made yesterday so there is always a certain plan.

"There are some more bits to come, obviously, but you definitely have some expectations and need to wait and see what happens on the track and that is what we are going to find out.

"We also need to see what other people are doing, what other people are bringing, so it's the same old game. We hope that we have better bits, more bits, to put us in a better position."