Wilder hopes to sign Brewster before Monday's deadline.
"I can't confirm that it's all been done but we have been in negotiations with Liverpool for a while and he has been on our radar for a while and discussions between the player and the club are still ongoing," he said.
"There's nothing to announce at this minute but we are down the line.
"Obviously when it happens I can confirm that but as we are at this particular time we are not over the line. I don't think you can guarantee anything until it gets over the line.
"We are always trying to bring better players into the football club and ones that can improve the group, and it is an area we need to improve, and that's not being disrespectful to the strikers we already have here, we need competition in the group.
"We need different options for different games. I've said consistently that we need to bring someone in and we have worked hard to identify players. Bringing better players into the group will improve us and help bring us better results."