Manly have suffered a double blow after their NRL victory over Parramatta, losing backrowers Joe Galuvao and Tony Williams to injury for up to six weeks.

Galuvao played the bulk of Monday night's match with a broken hand, while Williams left the field after just 17 minutes with a grade two hamstring tear.

The Sea Eagles confirmed on Tuesday that both forwards face four to six weeks on the sideline - a heavy price to pay for the 22-18 win.

Manly coach Des Hasler heaped praise on Galuvao, who played on after breaking his hand in the first half, knowing the Sea Eagles' bench was already down a man following Williams' injury.

Galuvao made 86 metres and 27 tackles despite Hasler admitting the 32-year-old was "in great pain" for the entire second half.

"He refused to have an injection at halftime. He is one tough player," Hasler said on Tuesday.

The news comes less than a week after young gun Will Hopoate was ruled out for up to six weeks with a hamstring injury, suffered in NSW's State of Origin II victory.

On a better note for the Sea Eagles, veteran winger Michael Robertson made a successful comeback from his knee injury against the Eels, while forwards Brent Kite (back) and Shane Rodney (shoulder) are expected to be available following Manly's bye in round 17.

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