The 20-year-old centre-back completed a season-long loan to Saints from Augsburg on deadline day.
Speaking after Saturday's 3-0 loss to Burnley, Hasenhuttl was excited for Danso to bolster his defence.
He said: "We will have a look and work with him during the week and show him how we want to play. He's quick learning I think.
"It's important for us to have more talent in the defence and this game showed that we have to.
"Finally I am happy that he is here."