Ings has scored 14 Premier League goals this season for the Saints.
When asked if Ings should receive an England squad selection, Hasenhuttl replied: "Danny was a constant high level performance player and I think it's because he was very fit during the season.
"He knows how to score and he has a fantastic strike and is fantastic at pressing. He changed his game a little bit. I think he's also adapted to what we do.
"When he has a chance he is very clinical. All the qualities you have to have if you want to be a top striker in the Premier League.
"I'm very happy for him because the last seasons were difficult with all the injuries and now he's feeling comfortable and still hungry, which is a good combination."