Nico Rosberg insists that he has nothing to lament regarding last year's controversial Belgian Grand Prix, despite acknowledging that it marked the beginning of the end of his championship hopes.

While he came off better in an early-race clash with Mercedes team-mate - and principal title rival - Lewis Hamilton, going on to finish second in a race where the Briton was forced to retire, the subsequent fall-out from a stern post-race 'chat' with the team appeared to spur Hamilton to greater success, as he reeled off a string of victories that culminated in his second F1 crown. Rosberg, however, maintains that, despite the outcome, he has no reason to bemoan what happened.

"It was a tough time after this race last year, but no regrets," he claimed, "I'm not going to go into the details, but I learnt a lot, things which changed my approach."

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The German also maintains that there will be no need for the two contenders to be reminded of their obligations ahead of this year's Spa round.

"No, because it was clarified after this race last year and discussed over the winter," he stressed, "Everything is clear."

Rosberg arrives in Belgium trailing Hamilton by 21 points after a late puncture dropped him behind the Briton in an eventful race for Mercedes in Hungary before the break, but he insists that the gap is not too big to bridge with nine races remaining.

"Hungary was very annoying because it was such a great opportunity to close the gap on Lewis and annoying to miss second place in such a way," he conceded, "It was tough but, as always, it is not long-lasting emotions, so I enjoyed the summer break.

"I just need to keep pushing the way I have and [things] just need to be slightly the other way. It is 21 points but, at times in the last race, I was leading the championship, so it was very close. What I think I need to do is keep on going like this, keep pushing, keep winning races, and I believe I can make it up."

Hamilton, however, is not the only one Rosberg needs to keep an eye on, with Ferrari's Sebastian Vettel refusing to concede his own title ambitions.

"We always expect them to be a threat," Rosberg said of the Scuderia, "Recently, we have been quick in qualifying, struggled a bit in the race in Hungary, but we understand why - and we still think we have the fastest car."