Gildart has previously said that he has a desire to play in the NRL and is under contract until 2021, but has a release clause allowing him to leave if a transfer fee is paid.
Brown confirmed on Saturday that the Warriors were in negotiations with de Belin.
“As far as the rest of the roster goes we’re still going through it. Young players starting to play well need to be looked after and older players, when their time comes, they need to move on,” Brown said.
“Over the next few weeks we’ll get our head around things. There’s a few ideas already but nothing that I’d like to publicly discuss.”