Ireland have expressed concerns about the state of the pitch before Saturday's decisive Pool A World Cup match with Samoa at the Fukuoka Hakatanomori Stadium.
Ireland's staff and players noted several worn patches during the captain's run on Friday and had been in contact with organisers about the issue at the Fukuoka venue.
"I mean, you guys are pretty smart. You would have seen the pitch yourselves," scrum coach Greg Feek told reporters.
"[Scrummaging] is always my concern ... When it comes to a static kind of isometric position [with] a couple of big packs going at it, you're always going to be a little bit cautious and ask the questions and that's all we can do, really.
"Prepare our guys as best we can, but also try to make sure the scrums stay up."
Ireland loose forward CJ Stander said organisers had run out of time to make too much of a difference to the problem.
"That grass out there is good grass, it's just not stable in a few points," he said.
"We saw a few grass patches … It's A-grade grass, it's just how to put it down. I think it just needs a bit more time, (but) there's nothing we can do about that now."
Ireland need a bonus-point win to be assured of reaching the quarter-finals, but their final position in Pool A may be taken out of their hands by Super Typhoon Hagibis.
Safety fears have already prompted the cancellation of two pool matches scheduled for Saturday nearer to the typhoon's expected trajectory, and Sunday's match between Scotland and Japan is also in doubt.
If organisers call off the Scotland-Japan game, the teams will share the points, meaning the hosts would top Pool A.
Even with a bonus-point win over Samoa, the best Ireland could then hope for in Pool A would be second place, which would mean a potentially tougher quarter-final against the champion All Blacks.
Japan would play Pool B runners-up South Africa in the last eight.
Stander said he had accepted that reality and felt Ireland could not complain too much about their lot, having put themselves under pressure with their shock pool loss to Japan.
"We let ourselves down against Japan," he said. "So it doesn't matter what happens. If we get a chance, an opportunity for the quarters, it's what we can do tomorrow.
"We can't look at other stuff, that's out of our control."
Join us at 11:45pm Saturday for live updates of the Ireland v Samoa Rugby World Cup clash.