Even though McBreen scored both goals, he attributed South China's victory to the stellar performance by the entire team.
South China went 1-0 up when the 38-year-old converted a penalty in the 28th minute after winger Mahama Awal was brought down by Bengaluru defender Curtis Osano.
He then proceeded to slot home his second goal of the match in the 58th minute to guide his side to a comfortable victory.
The 2-0 win not only allowed South China to qualify for the last eight, but also kept their unbeaten streak intact.
"The mentality of the players was tremendous," McBreen told the South China Morning Post. "The team played very well despite the bad conditions of the pitch."
However, South China assistant coach Ricardo Rambo was not in the mood to celebrate as he felt that his side wasted numerous opportunities to score in the second half.
"It was very competitive in the first half, but a goal advantage gave us confidence," he said. "We then had a very good second half and should have scored more goals, had we taken the chances."