The Ospreys and Blues are still to travel to Newport this season, throwing up some interesting derby games in the run in to the end of the season.
"They are all vying for play-off places so they'll be gunning for us," said Brew. "The derbies are always good games and we've got a good record against the Ospreys here.
"We'll be chasing the double against them, though our record is not so good against the Blues.
"But we've shown how we can do it by playing good, attacking rugby - and it's come off. It has been coming for a while now, we've just been working hard off the ball.
"Some of the tries against Treviso were training ground transfers and chasing those kicks.
"I've got to be thankful to Will Harries for one of mine, I'd told him to go out on the wing because of my ankle which was a bit of a strain."
