"I sit and listen to Adam Drury and Darren Huckerby talk about the success they've had, It's been disappointing that since I've come in we've not achieved anything, " he said.
Tigers chairman Adam Pearson and owner Russell Bartlett will now sit down to decide Dowie's fate while Benitez is also set for further talks with chairman Broughton on Wednesday.
Slater will fly out on Thursday, along with captain Cameron Smith and Kiwi international Adam Blair, after being involved in the weekend's All Stars game in Queensland and all three will sit out the Harlequins game.