Cristiano Ronaldo says his discontent with his career at Real Madrid has nothing to do with wanting to earn more money at the Bernabeu.

The Portuguese winger refused to celebrate either of his goals in the victory over Grenada on Sunday, claiming in his post-match interview he was sad with life in the Spanish capital.

"I am sad and the club knows it, that's why I didn't celebrate the goals," he said. "The people in the club know why. I'm not going to say anything else."

Cristiano Ronaldo
Ronaldo says he is sad at Madrid.

Ronaldo has now reacted to the furore around his revelation by claiming that his disenchantment with the La Liga champions has nothing to do with money.

"That I am feeling sad and have expressed this sadness has created a huge stir," he wrote on Twitter. "I am accused of wanting more money, but one day it will be shown that this is not the case.

"At this point, I just want to guarantee to the Real Madrid fans that my motivation, dedication, commitment and desire to win all competitions will not be affected.

"I have too much respect for myself and for Real Madrid to ever give less to the club than all I am capable of."

Ronaldo scored 46 goals domestically last season and won the player of the season award in La Liga as Madrid under Jose Mourinho wrestled away the title from Barcelona.

With Pep Guardiola having left the Nou Camp to be replaced by Tito Vilanov, Madrid, after winning the Spanish Super Cup, are expected to dominate again this season.

Despite scoring over 100 goals for Real in his three seasons at the club, Ronaldo is still to be offered an extension to his current deal beyond 2015.

The former World Player of the Year joined Real in 2009 for £80m from Manchester United, after leading the club to three successive Premier League titles, and the Champions League.

Both United and rivals Manchester City have been linked with a move for Ronaldo following the revelations over his disappointment at Madrid.