Warren Gatland is optimistic that Samson Lee will be fit for Wales' key World Cup games as he prepares to name his squad.
Gatland will name his 31 players for the tournament on Monday, following a morale-boosting win over Ireland in Dublin on Saturday.
There are bigger concerns over backs Liam Williams and Gareth Anscombe, who are struggling with a foot and an ankle injury respectively and look unlikely to be fit for the start of the tournament.
"Samson is making brilliant progress," said Gatland.
"He has been involved in live scrummaging, and he is running. We just need to get him fit, and hopefully he doesn't break down."
"Liam Williams is ahead of where we expected him to be, but he's still probably not going to be involved for the first game or two, or the first game anyway," Gatland added.
"The medical team are seeing where Gareth Anscombe is at, and that is a two or three-week injury as well. We are going to have to make a couple of tough calls on players.
"You might be able to carry one or two, but you've got to be careful how many injured players you go into the World Cup with. The last World Cup, we had a couple, and we may end up being the same this time.
"We have discussed as a coaching team what we think, and we have probably got 24 or 25 players nailed down."