Though he feels he won't have the engine capable of challenging team-mate Lewis Hamilton in the Italian Grand Prix, Nico Rosberg is confident he won't have trouble dismissing Ferrari at Monza.

The German starts fourth for the Italian Grand Prix behind Hamilton, Kimi Raikkonen and Sebastian Vettel, Rosberg blaming the fact he was forced to swap to a 'six-race old' engine after his newly introduced upgraded unit developed a problem.

Falling three tenths short, Rosberg was frustrated at the turn of events, which he says will 'compromise' his race enough to probably deny him a chance at challenging title rival Hamilton.

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Even so, he believes Ferrari adopted a 'qualifying mode' for its engine to secure a front row start, which he expects won't be make it as competitive come race day.

"For sure Ferrari [we can pass], Lewis is more difficult. I was seven hundredths away [from Ferrari] in qualifying and I don't think they will have the same modes that they had in qualifying. I think we have a good chance.

Despite this, Rosberg admits there is frustration that an opportunity to bridge the 28 point gap with just eight races remaining could go wanting at Monza because of the engine problems.

"It has done a lot of mileage, it has done 6 races and engines degrade over time, so it has definitely compromised my weekend and it will compromise my race as well. It is obvious from the data that the laps are good, but I lost a lot of time on the straights, so that makes it difficult.

"It has not been great because I need to start closing the gap now. It is not a great position to be in because my pace has been compromised."