The Norway striker says their early season form hasn't been good enough.
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"We've lost two games in a row, it's not good enough, it's way too bad," he told ViaPlay. "We need to figure it out, get back to winning ways.
"We can't afford to lose games as there's so many good teams. It's perfect to turn things around against United.
"We need to all be on our best, get ourselves going. (We need to) Get things going, because it has not been good enough so far. Losing's not cool. It's annoying, you need to use it for something positive.
"As motivation to do better the next game - and I expect that we are. We need to use the angriness inside us out on the pitch to deliver at our highest level."