Barca are one of a number of elite teams to have been credited with an interest in the Norway international, who has scored 49 goals in 50 appearances for Dortmund in his 15 months at the club.
Talk of a possible switch to Camp Nou intensified on Thursday when Haaland's agent Mino Raiola and father Alf-Inge were pictured in Barcelona reportedly on their way to a meeting with Laporta.
The pair were later spotted in Madrid and reports from Spain suggest talks are planned with a number of English clubs next week for arguably the most in-demand player in world football.
Koeman confirmed at a pre-match news conference on Sunday that he has held talks with recently elected president Laporta over possible targets, but he was unwilling to discuss any specific interest in Haaland.