The Brit retired from the last race weekend in Canada with complete rear brake failure, due to a problem with the MGU-K, and is now 22 points behind Rosberg, who managed to finish in second place despite suffering similar issues.
Hamilton failed to reach the chequered flag at the season opener in Australia, but four consecutive race wins helped the 2008 world champion to take the lead in the standings at the Spanish Grand Prix.
He then dropped to second place following his team-mate’s Monaco win and fell further behind last weekend at the Circuit Gilles Villeneuve.
Despite admitting that the two retirements are hurting his chances of taking a second title, he believes he can catch up. “Montreal was a bit of a strange one for me. I felt I had the pace right from the beginning of the weekend, but things just never quite came together,” he said.
“It’s frustrating when these things are out of your hands. The two DNF’s so far this season have not been ideal but that’s racing and there’s a long, long way to go. I caught up before and I can catch up again. It’s going to take another four wins to make the difference so I’m going to do my best to get those results.”
The next round of the 2014 Formula 1 season takes place in Austria, at the Red Bull Ring. The sport returns to the track for the first time since 2003, when it was known as the A1-Ring.
Looking ahead to the weekend, Hamilton added: “Right now, I’m just looking ahead to the next race in Austria and another chance to catch up to the lead. I’ve never driven the circuit but I’ve been working on it in the simulator and I’m sure I’ll learn it pretty quickly when we get out on track.
“It’s always exciting to go to a new venue, so it should be an interesting weekend. I’m feeling good in the car right now and I’ll be pushing flat out to come away with maximum points this time around.”
Image courtesy of Octane Photographic