Weaver's comments come after his side have failed to secure a single point from their three matches thus far.
"We have to go into the game looking for a win," he told the official AFC website. "We have to be positive and aggressive in our approach and take the game to Bengaluru."
Warriors FC came so close to beating Bengaluru during their 1-0 loss on March 17, coming close to finding the back of the net on a number of occassions.
To make matters worse for the Singaporean side, they will not be able to call on Argentinean striker Nico Velez as he is suspended.
"It was quite unfortunate for us not to get something in India," Weaver said. "We came close and hit the woodwork several times, so it gives us the confidence to get a result.
"As long as it is still mathematically possible for us to qualify, we will not give up."
Despite walking away with a win last time, Bengaluru coach Ashley Westwood is refusing to underestimate Warriors FC as he knows that they will do everything in their power to keep their hopes of qualifying alive.
"It was a tight game the previous time and we just edged it," he said. "We will be looking to try and score more goals from open play than set-pieces.
"With the tight schedule the Warriors have and the state of play in the group, I am not sure how they will be approaching the game psychologically."