Real Madrid star Cristiano Ronaldo is not envious of the relationship shared between Barcelona trio Lionel Messi, Luis Suarez and Neymar.

The Barca trio - nicknamed 'MSN' - have been in sensational form so far this season, firing the club to the top of La Liga and into the Copa del Rey final, with their friendship away from the pitch touted as a key factor behind their on-field form.

Conversely, Ronaldo's relationship with 'BBC' team-mates Gareth Bale and Karim Benzema is often reported to lack harmony.

However, the Portuguese does not feel he needs to be best friends with others at the club, citing the success he enjoyed at Manchester United despite rarely speaking to senior players.

He told reporters: "I will tell you, for instance, one situation: When I was at Manchester United we won the Champions League and I didn't talk to [Paul] Scholes, [Ryan] Giggs and [Rio] Ferdinand we only said 'good morning' and 'good night' and we were formidable on the pitch.

"I don't have to go to dinner with Bale or Benzema or invite them to my house. 

"What's important is our understanding on the pitch. Little meals or kisses and hugs don't mean anything. 

"The most important is what you do on the pitch in order to win for the team. That's what we should consider."

Ronaldo said he is used to being the focus of criticism from the media, but remains happy at Madrid.

"It's normal [that people have doubts about me], or that's how I see it. It's like with a son, you give him everything and when you didn’t give more, they will cry," he added.

"I face it as a normal situation. I wish I can keep playing this bad until the end of the season.

"I feel good and happy, in a club that gives me affection. I always play, I score goals from time to time. I cannot be happier. I'm at the best club in the world."

Madrid face Roma in the first leg of their Champions League last-16 tie on Wednesday, and the Portuguese thinks his team are favourites for the trophy.

"In all competitions, more so in the Champions League [Madrid are favourites]. We have more titles than anyone in this competition," Ronaldo said.

"We can still win La Liga, but we have a few points less."