Haaland is under contract with Dortmund until 2024. His transfer fee and wage costs would be out of reach for all but Europe's very richest clubs.
Champions League: Borusssia Dortmund bat off Erling Haaland speculation before Manchester City clash
Signed for just 20 million euros in January 2020, Dortmund reportedly want 180 million euros for Haaland, who has scored 33 goals in 32 games this season.
Already well aware of Haaland's quality, City boss Guardiola has a chance to take a closer look when Dortmund visit the Etihad Stadium for the Champions League quarter-final first leg on Tuesday.
Premier League: Manchester United's Ole Gunnar Solskjaer, Chelsea's Thomas Tuchel play down Erling Haaland talk
Haaland has emerged as one of the world's top forwards after scoring 21 goals in 21 appearances in the Bundesliga this season. Talk of a summer move has intensified after his agent Mino Raiola and father Alf-Inge Haaland were pictured in Spain.
According to Spanish media reports, Erling Haaland's father and his agent Mino Raiola will also travel to the Spanish capital to meet with Real Madrid president Florentino Perez.