ADAM EUSTACE scored Gloucester's only try as Dean Ryan's side lost 19-7 against Llanelli.
Ludovic Mercier added the conversion but Ryan blamed a lack intensity for the defeat at Stradey Park.
"We have these pre-season games to highlight problems we don't want to encounter in the Premiership and in that respect it was very useful," Ryan said.
"But I was disappointed with the intensity levels we managed to bring to the game, particularly from our forward pack. We saw an improvement in the second half but by then it was too late.
"At times we also displayed a lack of creativity because we could have scored a number of times - but it was the lack of intensity that bothered me most.
"We need to make sure we create the right environment for the Premiership and that is what these games are for."
Ryan praised the contribution of prop Christian Califano as once again 'outstanding' and hopes next week to be able to welcome back Andy Hazell, Olly Morgan and Mike Tindall.
"I am sure when some of those guys are back in the squad our intensity levels will increase - that is what we are searching for and we want we need - it will be good to have these guys back involved," Ryan added.
Gloucester will await fitness reports to Haydn Thomas, Mefin Davies and James Simpson-Daniel following the defeat.
Skipper Billy Twelvetrees told GRTV after the win in Brive that the game could have been a tough one to get up for, but that his Gloucester team mates did themselves proud on the night and got a big result.
Reflecting on the 31-20 victory in Brive on Thursday evening, Director of Rugby David Humphreys said that clinching a home European Rugby Challenge Cup quarter-final was the overall aim and duly achieved.
Gloucester may have already clinched a home European Rugby Challenge Cup quarter-final, but Director of Rugby David Humphreys wants his side to finish the pool stages on a winning note in Brive on Thursday evening.
Speaking after Saturday's win, James Hudson was happy to record a bonus-point win against a hugely physical Oyonnax side as Gloucester secured their passage into the European Rugby Challenge Cup Quarter Finals
Billy Burns was a try scorer on his first European start for Gloucester and, speaking after the game, admitted that it was good to get the five points although there are still things to work on before the trip to Brive.
Connacht's 30-20 win in La Rochelle on Saturday evening means that they are the third best placed runners up and will come to Kingsholm for the quarter-final of the European Rugby Challenge Cup in early April.
Gloucester Rugby today confirmed that supporters who have renewed their Club Membership for next season by March 27th 2015 will receive a free ticket for this season's European Rugby Challenge Cup quarter-final at Kingsholm in April.
It was a bit of an arm wrestle at times, but two tries in each half did the trick for Gloucester as they defeated CA Brive by 31 points to 20 at the Stade Amedee-Domench on Thursday evening to secure top seeding for the quarter-finals.
As the Cherry and Whites aim to make it six from six in the European Rugby Challenge Cup against Brive (19:45 ko) this evening, Dan Robson is fully focused on continuing the fine momentum of recent weeks.