Glasgow Warriors head coach Gregor Townsend voiced his frustration after seeing his side fail to make the most of their chances to get a potentially crucial bonus point against Montpellier.

The Warriors won the Champions Cup clash 21-10 at a freezing Scotstoun Stadium to continue their bid to qualify for the quarter-finals of the top European tournament for the first time.

However, a host of missed opportunities meant they were unable to get the extra point, which could end up costing them dear as they battle for a top-two finish in Pool Four.

Toony said: "It was frustrating to spurn so many chances to score tries. I think when you go up against a French team, and win, you should be really happy - and that's us done the double over them.

"But, as you can tell, we are extremely disappointed by how we didn't make the most of our opportunities."

DTH van der Merwe scored a hat-trick of tries, but Warriors fell short of collecting the valuable fourth try due to handling errors.

Townsend, whose side now face what looks set to be a decisive final-round showdown with Bath at The Rec on Sunday, added: "Maybe it was over-eagerness, or our accuracy or decision-making in that last 22, but it wasn't at the level it needed to be yesterday to get the victory we wanted.

"When you create so many opportunities and put pace on the ball and get down into their half, then it's about out-working the opposition and tries or penalties will come.

"But we maybe rushed things too much and didn't get in our right shape, which proved costly."

Canada international Van der Merwe, who became only the second Glasgow player to score a hat-trick in the Champions Cup, also felt that "silly mistakes" had let them down.

He said: "In the first half we didn't stick to the basic things which get you the tries. We went wide a number of times and maybe our eyes were too big, which cost us in the end with silly mistakes."

Townsend had said before the match that nine points were required from the final two games and, from the start, Glasgow turned down penalty goal opportunities to kick to the corner in the hope of the forwards getting over the line to build up a bag of tries.

Ironically, their first try came from an orthodox handling move, from right to left starting on the halfway line, in the 13th minute and had a suggestion of a forward pass.

It moved Glasgow in front after a Ben Lucas penalty had seen Montpellier take the lead in the sixth minute.

The Warriors' lead lasted only four minutes, though, as Montpellier showed Glasgow how to do the lineout drive from five metres out, with lock and captain Thibaut Privat scoring and Lucas converting to give them a 10-7 lead they held to the break.

Montpellier's lead came despite Glasgow dominating the final 15 minutes, but their close-in drives were always repulsed, with prop Pat Cilliers sent to the sin bin in the 33rd minute.

Glasgow continued their tactic of pinning Montpellier back with penalties in the second half and were rewarded with two more Van Der Merwe tries, both converted by Russell.

Their first chance to kick to the corner came in the 56th minute and, with the pressure on, the next penalty was tapped and Van Der Merwe found a way over. Russell again converted to put Glasgow back in the lead at 14-10.

As Glasgow piled on the pressure, Montpellier winger Lucas Dupont was sent to the sin bin with just over 10 minutes remaining and, a minute later, Van Der Merwe found his way through the weakened backline for his hat-trick try, which was again converted by Russell.

The final minutes were frantic, but Glasgow now go to Bath looking for a bonus-point win and will likely be without No.8 Josh Strauss, who was carried off on a stretcher late on with a knee injury.