ENGLAND international Olly Morgan will wear the number 15 shirt for Gloucester's pivotal Heineken Cup match against Bourgoin tomorrow.
Iain Balshaw moves to the wing to cover the absence of Lesley Vainikolo, who has returned to New Zealand for a week because of a family bereavement.
"Our thoughts are with Lesley and his family at this time and the club will give him all the support he needs before he returns to the first team squad," said head coach Dean Ryan.
"Family is very much central to Lesley's life and for that reason we respect his wishes to be with them at this time and want his privacy to be maintained. We will not be making any further comment until he returns."
The rest of Ryan's line-up remains virtually intact from the one that has seen Gloucester establish a narrow lead in Pool Two - although he is without second row Marco Bortolami (calf) and breakaway flanker Andy Hazell (twisted knee).
Mike Tindall and Anthony Allen will resume their centre partnership having missed the EDF Energy Cup victory over the Dragons and James Simpson-Daniel returns to the wing.
Ryan Lamb is partnered by Rory Lawson at half-back.
"We need to combine experience with flair and a cutting edge and we believe this backline provides that," Ryan added. "We are heading for a confrontational environment, an environment in which Bourgoin have a good record and we must be ready to handle that.
"The pool is very much still alive which is why these two back-to-back games are so important. Preparation has been good, we have learnt a great deal over the last year or so in this competition about how to win games like this and we must put that into practice tomorrow."
Ryan's forward pack is also experienced. Nick Wood, who signed a new two-year contract extension last week, starts at loose-head, Olivier Azam at hooker and Carlos Nieto at tight-head.
Peter Buxton will skipper the side from the second row alongside Alex Brown. That allows the tough tackling Alasdair Strokosch to wear number six, Akapusi Qera comes in for Hazell and Gareth Delve, outstanding against the Dragons, wears eight.
"Everyone appreciates the intensity levels of this game and central to that will be the performance of our forwards," Ryan said. "We have stacked up well in this competition and we must maintain that.
"This is a game we are thoroughly looking forward to as a group because of its significance."
Ryan has split his bench four-three in favour of his forwards. Andy Titterrell and Christian Califano will be the front row replacements Will James will cover lock and Luke Narraway the back row.
Scrum-half Gareth Cooper, stand-off Chris Paterson and utility back Leon Lloyd are the three-quarter replacements.
GLOUCESTER (v Bourgoin, tomorrow): Olly Morgan; James Simpson-Daniel, Mike Tindall, Anthony Allen, Iain Balshaw; Ryan Lamb, Rory Lawson; Nick Wood, Olivier Azam, Carlos Nieto, Peter Buxton (capt), Alex Brown, Alasdair Strokosch, Akapusi Qera, Gareth Delve. Reps: Andy Titterrell, Christian Califano, Will James, Luke Narraway, Gareth Cooper, Chris Paterson, Leon Lloyd.
Gareth Evans was a first half replacement for the Cherry and Whites on Saturday afternoon, but the back rower's impressive carrying kept the hosts on the front foot when they needed it most to snatch a dramatic comeback win.
After his last ditch try clinched the 42-40 Aviva Premiership victory over Newcastle at Kingsholm on Saturday, Billy Burns told GRTV that all the Gloucester team deserve credit for hanging in there against a Falcons team who really made life tough for the Cherry and Whites.
Speaking ahead of Saturday's Aviva Premiership fixture at home to Newcastle Falcons (kick off 3pm), Director of Rugby David Humphreys emphasised the importance this weekend of Gloucester building on last week's impressive home victory against the Exeter Chiefs.
Speaking to the assembled national and local media, try-scorer Jonny May was delighted and relieved to have tasted victory on Saturday evening, and is looking forward to the European Rugby Challenge Cup final.
Tom Savage delivered a Man of the Match performance against Exeter Chiefs on his birthday on Saturday evening. He spoke to GRTV after the game about the importance of the European Rugby Challenge Cup win.
Speaking to the local media this week, John Afoa described the hard work that the Cherry and White have been putting in and that he is fighting fit ready for Saturday's European Rugby Challenge Cup semi final clash with Exeter Chiefs.
An independent disciplinary hearing today found that Mariano Galarza was selected for the Aviva Premiership match against Sale Sharks on March 29th, when he did not hold effective registration for Gloucester Rugby. The club was fined £5000 and received a two point deduction, suspended for two years.