The Manly front-rower Brenton Lawrence is set to undergo surgery on his back later this week, meaning a long stint on the sidelines, the club has announced.

Fellow prop Josh Starling is facing at least another month out, back-rower Feleti Mateo is likely to be sidelined for one game, while centres Steve Matai and Jamie Lyon face fitness tests later in the week.

Click here for the full injury update on seaeagles.com.au.