Cristiano Ronaldo insists he is '100 percent fit' and ready to help Portugal break their losing streak against Germany in Monday's key World Cup clash.

The 29-year-old Ballon d'Or winner has laboured with a knee and thigh problem recently, but took a full part in Sunday's final training session in Salvador.

"I have been practising for a few days, which I couldn't do if I was injured," said Ronaldo ahead of the Group G clash.

"I'd like to be 110 percent, but I am at 100 percent and ready to help the national team.

"Obviously, I would like to play without pain, but in my entire career I have always had injuries and knocks to deal with, but I am ready to play."

The Arena Fonte Nova clash is a re-run of Portugal's Euro 2012 opener against Germany, when they lost 1-0, while the Germans have beaten the Portuguese at three of the last four major tournaments.

"Obviously the historical record has been positive for Germany recently, but I remember a recent case when Real Madrid couldn't beat Bayern Munich and that changed," said Ronaldo, whose Real beat Bayern in this season's Champions League semi-final.

"I hope this is the year Portugal change things against Germany and maybe tomorrow is when that will happen."