Marchese, 24, has won gold in the men’s 100m and 200m butterfly, while Pascali, 23, won silver in the 800m butterfly.
The Italian, who made history in Rio by becoming the first Italian to make the 200m finals, will compete in the 400m final.
Pascali is also in Rio with his parents and will compete for the country.
The 200m final was won by Pascales brother Luca.
Marchese was in a group with the other four members of his group.
Marcheso said he had no regrets about missing out on the bronze.
“The 200 was a good race and we knew it was a very important event,” he said.
“It is very important for us to win a medal, so we had to take it to the next level.”
Pascalis brother is also competing for the Italy team, and the team is hoping that the two will form a solid partnership.
“We are looking forward to winning silver, and it is important to have two strong players on the team,” Marcheso added.
Pescali and Marchessini were the last Italian to qualify for Rio, as Italy failed to qualify.