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Featured Image Credit: PA
Both super-agent Mino Raiola and Alf-Inge were recently spotted in Barcelona as speculation over the 20-year-old Dortmund striker's future continues to mount.
The Haaland camp's trip was ill-timed as Dortmund prepared for their clash with Frankfurt at the Westfalenstadion.
The German club suffered a 2-1 defeat and are now seven points behind fourth-place Frankfurt in the Bundesliga table.
Dortmund's potential failure to qualify for next season's Champions League could lead to Haaland pushing for an exit in the summer.
German legend Dietmar Hamann has now blasted the behaviour of Raiola and Alf-Inge, saying it was "unspeakable, disrespectful, a cheek."
The 47-year-old former Bayern Munich midfielder told Sky Germany: "The behaviour of Haaland's father and Raiola is unspeakable, disrespectful, a cheek.
"If he wants to go, let him go. Dortmund paid a lot of money for an 18-year-old, he should be happy that he can play there.
"Dortmund should think about why the players are always walking all over them. They lack leadership there.
"It's the most important game of the season and you are not able to address this behaviour because you are afraid to upset the player."
Haaland, who is under contract until 2024, has been linked with Europe's top clubs like Manchester City, Barcelona, Real Madrid, Manchester United and Chelsea.
Dortmund could be forced to sell the Norway international in the summer ahead of his £68m release clause becoming active in 2022.
The Bundesliga club initially landed Haaland in 2019 from RB Salzburg after triggering his £17.1m buyout clause.
Dortmund return to action tomorrow as they travel to the Etihad for the first leg of their Champions League quarter-final clash with City.