Los Blancos were held at home by Valencia in a 1-1 draw on Sunday and the Portuguese superstar revealed that his side still have work to do on the training ground to improve their competitiveness.
"We're not yet in the best shape physically," Ronaldo said after the game. "It is normal. We'll be better, we are trying to. We have tried everything, but still need to reach the highest level we can.
"The equaliser was a pity; we had given everything to win. We had many chances but it was not to be."
Madrid will now turn their attentions to archrivals Barcelona, who they face in the first leg of the Super Cup at Camp Nou on Thursday evening.