Only a point behind Persipura Jayapura, a win at Sree Kanteerava Stadium would ensure JSW clinch the group and a home draw in the one-off Round of 16 tie.
Westwood said that they have watched the undefeated Indonesian side and are aware they will be very tough to beat.
"We've watched a few videos on them and they are a very good side. They are a good footballing side who keep the ball on the ground so playing against them home or away would be a difficult game anyway," said Westwood.
"Also, we are the ones in need of the win if we are to top the group and are under no illusions that this will be a very tough game.
"We've already qualified for the last 16 so we can go into the game fairly free and without putting ourselves under pressure. We can go and see how good we are which is what the AFC Cup has been about for us this year – testing ourselves," he added.
Persipura coach Osvaldo Lessa says his side will be going all out for a win in India.
"We won't play any differently from how we did in Jayapura. We have to play intelligently because Bengaluru is a strong team. I don't want a draw because we are playing for a win. We hope to have a good game," said Lessa.
"Many of the Bengaluru players didn't play in Jayapura. I have spoken about this with my players but I won't change my plan or strategy.
"I respect Bengaluru and they are a very strong team but I won't change my plan," he added.
In the other Group G game on Tuesday, the two eliminated teams, Singapore's Warriors FC and Maldivian club Maziya Sports & Recreation, face off in Singapore.