Barcelona defender Gerard Pique compared Paris Saint-Germain star Kylian Mbappe to Brazilian great Ronaldo as he hailed Borussia Dortmund sensation Erling Haaland.

Mbappe and Haaland are two of the most in-demand players in the transfer market, with LaLiga giants Real Madrid reportedly interested in both.

PSG's Mbappe – entering the final year of his contract in Paris – has long been tipped to join Madrid, while Haaland has also been linked with Barca, Chelsea, Manchester City, Manchester United and Bayern Munich.

Mbappe scored in PSG's 4-2 Ligue 1 win at home to Strasbourg on Saturday, having now either scored or assisted in seven consecutive matches in the competition (eight goals, four assists).

Haaland took his tally to 62 goals in 61 games for Dortmund after bagging a brace as the German giants opened their Bundesliga season with a 5-2 rout of Eintracht Frankfurt.

Pique was asked to pick between Mbappe and Haaland in an appearance on Twitch following Barca's 4-2 victory over Real Sociedad on Sunday, and he replied: "Mbappe and Haaland are different.

"One is very similar to Ronaldo Luis Nazario, who is Mbappe. Haaland is more powerful, stronger, he is a goal killer."

Barca kicked off the Lionel Messi-less era by seeing off Sociedad at Camp Nou in the opening game of the LaLiga season.

Messi – the club's all-time leading goalscorer – joined PSG after his contract expired, with Barca's financial difficulties forcing the six-time Ballon d'Or winner to leave.

"It was tough," Pique said on Messi's exit. "I have known him since I was 13 years old.

"He has made us all better. We have to accept it because it is reality. We will all step forward to be competitive."