After leading for most of the game thanks to a first half Daniel Sturridge strike, Daniel Agger gave away a penalty for handball with just a few minutes left.
Mignolet, a summer signing from Sunderland, heroically dived to his right to deny Walters and then blocked the follow-up from Kenwynne Jones to hold on to Liverpool’s 1-0 lead and claim an opening day victory.
Toure, like Mignolet, making his debut Liverpool, said Mignolet’s confidence grew throughout the game.
“It was an unbelievable double save,” he said.
“It was normal for Simon to be nervous early on. As a keeper you don’t touch the ball as much.
“You don’t need them many times in the game but when you do the best ones are there waiting. Simon showed that he’s a fantastic goalkeeper.
“We had some chances to kill the game and didn’t take them but we got the three points.
“We have been working so hard with the manager during pre-season. The spirit in the squad is very good and the mentality of all the players is great. We won as a team.”
The Ivorian international defender also said that Mignolet’s penalty save will boost everyone at the club.
He added, “It’s fantastic for all the supporters and the players for us to start like this. It will give everyone a big lift. This win will be important for the future of this football club.”