Wales back-rower Ross Moriarty says the back injury he suffered in June 2017 was a "lot more serious" than he expected.
Wing Eli Walker is out of Wales' World Cup squad after suffering an injury, making way for back-rower Ross Moriarty.
Wales back-rower Ross Moriarty is unsure if he will return from injury in time for their four autumn Tests.
Gloucester flanker Ross Moriarty expects to miss Wales' autumn international against Australia in November.
Wales international Ross Moriarty returns to action for the first time since June when Gloucester face Leicester in the Anglo Welsh Cup.