Nico Rosberg says 'giving up doesn't exist for him' as he refuses to acknowledge that his 2015 Formula 1 title dreams are looking increasingly slim following a costly DNF in the Italian Grand Prix.

Already coming into the weekend facing a sizeable 28 point deficit to Mercedes team-mate Lewis Hamilton, Rosberg was shifted further onto the back foot when an issue with the team's upgraded engine forced it to revert to an older unit ahead of qualifying.

Attempting to complete six full races with the ageing unit, Rosberg had successfully recovered from a poor start to run in third, but just as he seemed poised to attack Sebastian Vettel for second place, the engine cried enough two laps from the end.

Related Articles

His and Mercedes' first DNF of the season, the exit comes at a critical time for Rosberg since Hamilton's maximum points' haul swells his advantage to 53 points - the equivalent of two races.

Despite this, Rosberg is refusing to dismiss his title aspirations, saying he must now get his head down and do his bit by getting back to the top of the podium at least.

"It is a fact that it has made a massive step in the wrong direction," he concedes. "Just when I needed to catch up points, it is the biggest loss I have had in the whole season. But I keep going, giving up doesn't exist for me so I just have to keep fighting and try and win the next couple of races something."

Reflecting on the weekend as a whole, Rosberg is frustrated that an already difficult weekend was made harder to swallow by late retirement.

"It is very, very disappointing. The whole weekend went wrong, I was ver unlucky. So many repurcussions. It wasn't even an engine issue, it was a chassis issue that made me have to change the engine. Just a difficult race as a result, so to have it explode two laps from the end is unbelievable, it makes it more disappointing."