“During my visit, I had several intense conversations with the club management team, in particular, Dortmund’s chief executive Hans-Joachim Watzke, sporting director Michael Zorc and coach Lucien Favre.
“They were all really keen for me to join and from the very start I knew I wanted to move here.”
United face competition from Real Madrid for Haaland.
The Spanish giants have identified the Dortmund star and PSG forward Kylian Mbappe as their top targets.
Real will go all out for Mbappe with club president Florentino Perez willing to wait for Haaland if needs be.