Talking to the Evening Times, Grigg said: "We worked hard in pre-season and so the first two games have been disappointing. But we've another home game this weekend and so we're hoping we'll get back to winning because we really need it leading into the one-week break.
"I think accuracy is the main thing. Against the Cheetahs, it was more effort and the players needed to work harder around the field but I felt like we got a push and had that effort last Friday but it was accuracy that let us down in key areas of the field. But if we can get our basic skills and accuracy right in this game we should be able to put Cardiff away."
Warriors may not have had the start to the season they were looking for but Grigg remains confident that having reached the semi-finals and the final in the previous two season, they can go one better this year.
"I think we can be right up there again this season," he said.
"Even with Scotland guys away in previous seasons, we've pushed other teams and won most of our games so we're feeling good about things, even when we have guys missing. We have the ability to do well, we just need to show it on the field."