After Toto Wolff admitted he wasn't sure why Lewis Hamilton couldn't find grip during qualifying, the Brit stated he'll have some tough discussions with his Mercedes team to try and sort out the problem.
Hamilton will start Sunday's F1 Monaco GP from seventh on the grid, five places behind championship rival Max Verstappen. Monaco is a track where it is notoriously difficult to overtake, and Hamilton believes the team haven't done the things they need to in order to be competitive.
"There will be some tough discussions that we're going to have with my engineers tonight, or maybe after the weekend," Hamilton told RacingNews365.com and other members of the media after qualifying on Saturday.
"There's things that should have been done, and haven't been done. But we will learn from it and come together, stronger in the next race."
Hamilton wouldn't expand on what specific improvements have to be made, stating those talks will be held behind closed doors.
"I can't really, no," Hamilton added. "From my point it's a little frustrating, but it is what it is.
"I can't really say too much about it, and also I don't want to be critical of the team, but behind closed doors, I will be. And we have got to work harder."
One of the big issues Hamilton has encountered is tyre temperatures, with Mercedes unable to get them up to temperature as quickly as the likes of Ferrari and Red Bull.
"We definitely struggle [with getting heat into the tyres] and I think this is magnified here being that it's obviously a low energy circuit," Hamilton added. "There's not really any high speed areas and today it was much cooler. So it's sort of get worse over the day or so.
"So I'm not really sure how Valtteri [Bottas] is able to get his tyres working. I saw a glimpse of grip on that last lap, but it was short lived. So there'll be a lot of analysis."