Cole Forbes went over for Glasgow's second try

Lyon had to come from 27-13 behind to beat Warriors 35-27 and secure a Challenge Cup semi-final spot.

Warriors had initially going 13-6 ahead through Josh McKay's try and two Ross Thompson penalties.

Although Baptiste Couilloud levelled matters - adding to Leo Berdeu's earlier brace of three-pointers - Glasgow immediately responded with Cole Forbes handing them a 20-13 advantage at the break.

That became a 14-point buffer when the Warriors were awarded a penalty try, but they were unable to hold onto the lead as Lyon increased the intensity.

The Frenchmen reduced the deficit through Romain Taofifenua before Niniashvili got the first of his two tries.

Berdeu missed the conversion to equalise but the fly-half was on target in the 71st minute to take them ahead and the hosts completed the victory through Niniashvili.

"We're missing 13 frontline players right now and that's tough at the business end of the season," said Head Coach Danny Wilson.

"There's a plus there in that we get guys like Gregor Brown, Nathan McBeth and Lewis Bean game time, but it's tough.

"Key moments once again are hurting us, though, Once again we've got ourselves into a position to win the game, and we haven't closed it out. That's something we're still addressing and that we need to hammer home until we fix it.

"This group of players has gone Newcastle away, a double-header away in South Africa and now away to Lyon, all in a short space of time. That's a long stretch away from home.

"To come out here and play with that level of passion in our game and put ourselves in the fight with a good lead against a very good and in-form Lyon team, I'm proud of the effort the boys showed."