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Twitter tough enough to do battle with the most imposing of teams.

“I think there’s been lot’s of question marks around whether we’re tough enough up front.

“We were really confident the guys would get up for [Saracens] and the guys need to do it seven days later,” said their coach, as he sought to re-set sights on this weekend’s do-or-die visit to Cardiff Blues.

“If you’ve got any aspirations of winning silverware at the business end of the year you have lots of big games. We’re confident we are playing well, have prepared well and there’s no reason why we can’t fire again on Sunday.”

Maximising their opportunity to do so requires careful management.

“Each week is different, so we’ll do a little bit less at the start of the week to make sure we get some of those battered bodies sorted,” said Rennie. “We’re well into our season so the boys are pretty clear with what we are doing.

“Anything new we will introduce today to make sure the boys have got that clarity.”

However the impression is that if Glasgow could match the physicality they showed against Saracens, they could blast aside the challenge of both Cardiff and Lyon and set up a pool decider with the Premiership club in the final match.

Success would mean they could qualify for the quarter-finals as one of the best-placed runners-up. But Rennie knows it will take more of the same in all four of those games if they are to go to Watford with any realistic hope of involvement in the knockout stages.

“We’ve got to bring that intensity to each game,” he said. “On the back of that, we’ve just got to be far more clinical. If we can defend like that and if we can be can really physical in our carry and clean, you give yourselves a chance.

“Our set-piece has been going well.

“Cardiff are a good side. They had a good result last week. Playing them at home, if they can win it, puts them in a strong position.”