Melbourne lock Dallas Johnson has been cleared of a serious knee injury, but still faces a difficult task to be fit for the Storm's NRL finals opener against New Zealand on Sunday.

Scans revealed Johnson had a grade two medial ligament strain after injuring his knee during the Storm's minor premiership-sealing win over Souths at Olympic Park on Sunday night.

But assistant coach Robbie Kearns said the club believes Johnson would miss one match at worst with the injury, and could even take his place against the Warriors.

"He's been a bit sore but there's no structural damage as I understand it," Kearns said.

Johnson is likely to be given until as late in the week as possible to prove his fitness to play the Warriors at Olympic Park.

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