Manly Sea Eagles coach Trent Barrett has previewed Monday night's clash against the St George-Illawarra Dragons at Brookvale Oval.

The former Dragons Five-eighth concedes that Monday night's clash at Brookvale Oval is a must win game.

"It's a must win game. Mathematically we know we can still make the finals but we have to get the job done tomorrow night," Barrett said.

"Last week was a good performance despite the result, it was pleasing to see and we must back that up against the Dragons tomorrow night.

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