McLaren's Jenson Button was left frustrated and downhearted after 'a loss of power' compromised his performance in qualifying for the 2013 F1 Monaco Grand Prix.

The Englishman had been aiming for a top-five slot at the Principality, but issues with his MP4-28 in the top-ten shootout meant he was unable to challenge and he finished up ninth, his best lap a 1m 15.647s, which left him 0.509 seconds off team-mate, Sergio Perez and 0.825 seconds off the Lotus of Kimi Raikkonen in fifth.

"I'm not sure what happened on my final lap in Q3. We had an issue with the car right at the end - I didn't have any power, so I couldn't post a quick lap," Button explained.

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"It's a pity because, apart from that problem, it had been a great qualifying session for me. The team did a great job in terms of putting me out on the right tyres at the right time, while I felt I was driving well, making the most of the conditions. The pace was good, but that doesn't matter when you have an issue at the end.

"Tomorrow's race will be difficult now. Being up in the top-five and being ninth [on the grid] is a massive difference [especially in Monte Carlo]. If you want to do your own strategy and follow your own ideas in the race you can't if your team-mate is in front of you. It is going to be a tough afternoon.

"But on this occasion there's absolutely nothing I could have done about it," he added.

McLaren meanwhile has confirmed that the team saw 'signs' of the power loss problem at the end of Q2. It is currently investigating the cause.