The Sharks had two tries knocked back in their 28-16 win over North Queensland on Saturday night, after one was denied against Melbourne last week as well as two in their loss to Manly a fortnight ago.

"We must have (a problem)," Flanagan said.

"Just a little bit of attention to detail. I think they have probably all been no tries looking at them.

"We just need to fix it up a little bit. It's a matter of centimetres here and there on a couple of them."

It's something Flanagan is insistent his team must fix in the next three weeks before the finals begin.

"If you don't nail the opportunities in those big games coming up you'll be out the door pretty quickly - we'll fix it up," he said.

"We're getting across the line but we've just got to fix up a few attention to detail things off the ball, it's not on the ball."

Regardless, Cronulla's attack was good enough to help them keep pace with the top four in Saturday's win.

The Sharks are now equal with fourth-placed St George Illawarra and fifth-placed Penrith on wins after the latter's loss on Saturday, but behind them both by less than 20 points in for-and-against.

Cronulla look to be the form team of the trio and have the easiest run home in Newcastle and Canterbury, crucial given no team has won the title from outside the top four in the NRL-era.

"It'd be nice. We've just got to keep winning with our last two games and see what happens with those other teams," Flanagan said.

"If we win our last two games and don't make the top four we've just got to get on with it.

"We just need to concentrate on what's next, that's the sort of attitude we have."

Flananagn will sweat on the fitness of centres Ricky Leutele (knee) and Jesse Ramien (ankle), who both left the field injured on Saturday night, and didn't return.

Flanagan was hopeful after the match neither injuries were major and that both players would miss just one week - in what would be their final home games before the pair leave the club at year's end.

Meanwhile, second-rower Wade Graham is expected to make a return from a knee injury against the Knights next Sunday.

Australian Associated Press