Denmark begin their Euros campaign against Slovenia, with Hojland having scored just one goal in his last eight for Denmark.
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Hjulmand said: "I don't know, it comes in phases as a striker. You have this period where you score a lot of goals but thankfully Rasmus makes a big impression in all of the games.
"He always makes a big difference so it's not a concern and I am sure the goals will come.
"Sometimes you will have to fight for the goals and sometimes they will go in every time you shoot."