Cristiano Ronaldo
Real Madrid forward Cristiano Ronaldo has scored just once in La Liga this season Getty Images

Sergio Ramos has refused to be drawn on speculation that his Real Madrid teammate Cristiano Ronaldo is unhappy at the Santiago Bernabeu and wants to leave the club at the end of the season.

Spanish TV station El Chiringuito reported that Ronaldo had told Real president Florentino Perez that he would not sign a new contract and that he wanted to leave in search of a fresh challenge next summer.

Ronaldo, 32, signed a five-year deal at Real in November last year worth a reported £365,000 ($480,000) per week.

The Portugal captain reportedly feels underappreciated in Madrid and is alleged to have told Perez to let him leave for a "reasonable price". He has also expressed his unhappiness over being accused of tax fraud amounting to more than $17m by prosecutors in Spain.

Speaking after Spain's 3-3 draw with Russia in St Petersburg, Ramos denied any knowledge concerning Ronaldo's state of mind at Real.

"Cristiano is leaving? Ask him, I don't know about these things," the centre-back told Marca.

Ronaldo is in the midst of a slump in form, having scored just once in La Liga in seven appearances for Real this season.

Speaking after the Spanish giants' 3-1 defeat against Tottenham in the Champions League on 1 November, the forward insisted that he would not renew his contract with the club.

"I don't want to renew. I don't want to renew," Ronaldo was quoted as saying by the Sun. "I'm very happy with the contract I have."

Manchester United and Paris Saint-Germain have been touted as potential destinations should Ronaldo opt to leave Madrid.

Meanwhile, Ramos was also questioned over the future of Athletic Bilbao goalkeeper Kepa Arrizabalaga amid reports that Real are interested in signing him next summer.

"We'll see what happens, the season is very long," the veteran defender stated. "These subjects change in the summer, he is a great goalkeeper with a lot of potential.

"He has things to learn, with pressure you have to learn how to deal with it."