Munster head coach Johann van Graan has revealed that Conor Murray does not want the details of his injury disclosed as mystery continues to shroud the extent of the scrum-half's neck problem.

On Monday, forwards coach Jerry Flannery said Murray was "progressing well" while shying away from giving an estimated date for a return to action.

He hasn't played since Ireland's final Test match against Australia in June. The province have since signed Kiwi Alby Mathewson as cover but it's not clear when Murray will be back in the fold or exactly how far down the road he is to making a full recovery.

"I can't comment on Conor," Van Graan told RTÉ Sport's Damien O'Meara on Wednesday ahead of the Champions Cup launch.

"Upon his request, I can't comment on his injury. He's requested that his information remains confidential. I can't really comment on that. 

"I've got to respect that. From the first day we've handled his injury accordingly. We take care of all of our players very well I believe."

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Murray's request for confidentiality regarding his injury follows on from Jamie Heaslip's insistence the nature of the back injury that eventually forced his retirement remain out of the public sphere.

One man who should appear in this weekend's Pro14 derby against Ulster is Keith Earls.

He has yet to play this season having taken an extended summer break, but the 30-year-old is in good shape and on track to play a part in Saturday night's clash at Thomond Park. 

"Keith Earls might be back this this weekend," added Van Graan.

"Alex Wootton has been back for the 'A' team over the past few weeks. Niall Scanell is close to fitness, and Kevin O'Byrne is close to fitness. We hope to have some of them available for the weekend. We've still got a long list of guys not available.

"I'm looking forward to getting some guys back. I'd love to just for once be able to pick my best 23 for a game. Hopefully that'll come at the right time."