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.
Ahead of Friday evening's Aviva Premiership fixture away at London Welsh, Head Coach Laurie Fisher told the local media that he feels that Gloucester are making improvements each and every week but that there's still plenty of work to do.
Speaking to GRTV on Monday night, Pete Buxton was thrilled with the spirit shown by the Gloucester United squad as they overturned a twenty-one point deficit in the second half to overcome Bristol Rugby.
Scrum half Callum Braley was a try scorer in Gloucester United's 30-27 win over Bristol United in the Aviva Premiership A League on Monday evening and, after the game, paid tribute to his team mates for hanging in there and fighting back to get the win.
Skipper Billy Twelvetrees admitted that the Gloucester squad were disappointed and frustrated after losing at home to Exeter, regretting that Gloucester's own errors had given the Chiefs the upper hand.