Warriors are still licking their wounds after their record-breaking six-game winning run came to an end at Scotstoun.
But, with Munster also losing at home to Scarlets for the first time, Gregor Townsend's team remain third.
And fired-up flanker Fusaro is ready to take out his dismay over the defeat by bouncing straight back with a victory over the Munster men.
He said: "There was an awful lot of frustration in the dressing room after the Leinster defeat. It all came down to such fine margins, and we had more than enough ball and territory in the second half to overturn the six-point deficit and get the win.
"But what we have to do is use that frustration to fuel our determination at Thomond Park on Saturday.
"There is not too much wrong with us and, at this level, it all comes down to fine margins. We feel we are hammering on the door in the big games, but it's just not giving.
"That has to change on Saturday. Right now we are third and Munster are fourth and trail us by two points.
"So it's vital we get the win that will damage them and help us consolidate third place and extend our lead over them.
"Plus, to get a win at Thomond Park would be a huge boost going forward into the Heineken Cup double-header with Castres. So this is just a massive game."
Positives gained from the match despite the defeat were countered by Warriors' inability to kick straightforward penalties that could have changed the direction of the game and the result against the European champions.
Peter Horne and Scott Wight will have been disappointed with their three combined missed kicks, so the likely return to the fray of Duncan Weir will be a huge boost.
Similarly, the lineout was another area of concern. As with the recent Heineken Cup home encounter with Ulster when Glasgow were in the enemy 22, the lineout throw-in went long and was lost either being adjudged to have been squint or lost.
And again, there was a willingness to kick which was, at times, premature.
Yet the Warriors pack was magnificently dominant against the European champions for the entirety of the second period, and Fusaro said: "We felt like we were really on top of Leinster as a pack and it will be vital that we retain these standards at Munster.
"But any game against Munster at their place is a huge test and it is up to us to make sure we come through it."