"We created chances enough in the first half, and then, to be honest, it has been my mistake because I did the change before I saw the extra time," Maresca told reporters.
"When I saw 12 minutes, I saw that probably was too early to make that kind of change. But fortunately, we won the game, and we are happy."
Despite his admission of a tactical error, Maresca was quick to heap praise on his players for their resilience and determination during the frantic finale.
"If you want to become a team, I think you need also to learn and to play in the way we played in the last 10 minutes: win a game in a dirty way," the Italian said.