GLOUCESTER'S Wales number eight Gareth Delve will have surgery on July 9 to assess the damage to his Anterior Cruciate Ligament (ACL).
Delve will undergo his operation following consultation with specialist Andy Williams and will be out of action for a number of months and will miss the start of the season.
The 25-year-old suffered damage to his left knee during Wales' summer tour to South Africa and Gloucester's head coach Dean Ryan said: "Gareth is a tremendous individual and an outstanding player - someone we wanted to build around for the future.
"This injury is obviously a significant set-back to him and the club but I have no doubts he will be back in Gloucester colours next season. He has drive, determination and a willingness to succeed and I am sure that will come through in his recovery."
Delve made 20 appearances in all competitions for Gloucester last season following his summer move from Bath.
Meanwhile, flanker Akapusi Qera will see a specialist in London on Monday to determine the extent of his knee injury.
Henry Purdy scored two memorable tries against London Welsh at Kingsholm on Saturday, and attributed the first one to hard work on the training ground before describing how much he's enjoying playing his rugby alongside friends like Callum Braley.
Gloucester face London Welsh for the third time this season when they meet at Kingsholm in the Aviva Premiership on Saturday (kick off 3pm), but Director of Rugby David Humphreys insists his team are prepared for a tough game against the Exiles.
Billy Burns was a late call up to the Gloucester team that lost narrowly to the Leicester Tigers at Welford Road on Friday evening and, speaking to GRTV post match, was full of praise for his team-mates but admitted that defeat was tough to take.
Speaking after what he described as an 'arm wrestle' up front, skipper Tom Savage couldn't fault his side's effort and commitment on the night at Welford Road but insisted that his side will keep on battling, starting at home to London Welsh next weekend.
A number of the Gloucester Rugby squad this week benefitted from an initiative organised by Circle 2 Success (C2S) and the Rugby Players Association (RPA) to help players develop their business planning skills.