Penrith star Michael Jennings has revealed he is playing with a knee injury which could require mid-season surgery.

Jennings has torn the lateral meniscus in his left knee and says it has affected his early season form.

"I'm not at a hundred per cent and I've just got to look after it and see how I go," he told Network Ten.

The Test and NSW State of Origin centre will keep playing with the injury rather than going under the knife immediately.

An operation would be likely to sideline Jennings for two weeks, the report said.

"I'll keep playing and I'll see if I need an op or not," the 21-year-old said.

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