Bayern Munich's frustrations with referee Victor Kassai after their Champions League exit to Real Madrid on Tuesday have been well documented.

Kassai made a series of controversial calls during the second leg clash at the Bernabeu - including the decision to send Arturo Vidal off - which appeared to favour the home side, who ran out 4-2 winners on the night.

Carlo Ancelotti's men were so incensed at the final whistle many even tried to confront the Hungarian official in his dressing room.

Reports emerging over the course of the week have speculated that Robert Lewandowski, Vidal and Thiago Alcantara were even removed from Kassai's room by police.

However, well-informed Spanish journalist Guillem Balague has revealed that Lewandowski was distracted during the confrontation by Cristiano Ronaldo and Sergio Ramos.

Ronaldo and Ramos' aim wasn't to try and calm the Polish striker down, however. They were trying to convince him to join Real Madrid.

Los Blancos have been admirers of Lewandowski for some time now and seemingly would still like to sign him at one point in the future.

Despite the intense competition for forward places in Zinedine Zidane's starting XI, it is believed the Madrid duo even guaranteed there was space for Lewandowski at the club.

Writing for AS, Balague said: "It was one [a conversation] between Cristiano Ronaldo and Sergio Ramos, the two most influential players of the Real Madrid changing room who, after an exchange of compliments, they asked him, without reservation, to sign for Los Blancos. There was room for him."

This is not the first time Real Madrid have gone on the charm offensive to take the initial steps towards a future switch for Lewandowski.

President Florentino Perez also approached the Bayern star once after he had scored four goals past his side for Borussia Dortmund in 2012 to praise Lewandowski and wish him the best for the future.

But it was up to Ronaldo and captain Ramos on this occasion and although no drastic developments are made during such brief conversations, Balague did add: "The Pole did not reject this possibility"

Nevertheless, trying to manufacture a move in the short-term will be extremely difficult and costly given Lewandowski recently signed a new contract that is expected to keep him at the Allianz Arena until 2021.

It is little wonder why Madrid are so keen to sign him, though.

After scoring against them again on Tuesday, Lewandowski now has 39 goals to his name this season, including 26 from just 28 games in the Bundesliga.

So watch this space. When Real Madrid want someone, they usually sign them eventually.