Haug linked up with United last week and is also set to link-up with rivals Manchester City, Everton and Arsenal.
“The experience has been fantastic,” Haug is quoted by Sarpsborg Arbeiderblad.
“Here they care about real people to thrive, and everything is organised in the best way.”
He added: “We will be with City for three days now and later this year Arsenal awaits and then another stay at Everton where I have been before.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.