Scotland and Edinburgh flanker John Hardie has been suspended from club and country duty pending an investigation.
The 29-year-old has been has been told he will not be selected for next month's autumn Test series.
No explanation has yet been given for the disciplinary action but it means he will miss Edinburgh's Challenge Cup match with Krasny Yar on Saturday, as well as the Dark Blues' international clashes against Samoa, New Zealand and Australia.
The 29-year-old was expected to be part of Gregor Townsend's squad when it is announced on Monday.
A Scotland Rugby statement read: "Scottish Rugby and Edinburgh Rugby confirm Scotland international and Edinburgh forward John Hardie has been suspended from duty pending an internal investigation.
"As a result the player will not be available for selection for Edinburgh or the Scotland National Team.
"It is normal practice with such matters that we are unable to comment further given the nature of the investigation."
Hardie becomes the second Edinburgh player to become the subject of disciplinary action in the space of the last week, captain Marcus Bradbury having also been suspended by the Guinness PRO14 outfit after sustaining a head injury on a night out with friends two weeks ago.
However, it is understood that the two incidents are not linked.
Hardie, 29, was born in New Zealand but qualifies for Scotland thanks to his Fifer grandmother.
He has won 16 caps since making his international debut in 2015, including three appearances at that year's World Cup, and he was part of the Edinburgh team which beat London Irish 37-14 last weekend.
The news of his suspension comes as another frustration for Townsend, who has already seen skipper Greig Laidlaw and hooker Fraser Brown ruled out of next month's Tests through injury.