Shinji Okazaki's fifth league goal of the season sealed the win for Leicester.
Leicester City boss Claudio Ranieri heaped praise on his players after beating Newcastle 1-0 at the King Power Stadium on Monday night.
Shinji Okazaki broke the deadlock with an overhead kick in the first half and the Japanese's strike was enough to seal three points over the Magpies as the Foxes extended their gap at the top of the Premier League table to five points.
"When you change a manager, players want to show their attitude, and plus, the Newcastle players are very good," Ranieri told Sky Sports. "I am sure at the end they will be safe [from relegation].
"For this reason, I was waiting for a difficult match and it wasn't one of our best performances but we showed our fantastic spirit.
"In the first half, we conceded too many dangerous actions and in the second half, we were a little more concentrated and won the first and second balls. In the first half, we lost so many balls.
"It was important somebody scored the goal and then we defended very well. In this moment, it is important for us to play and to fight."
More: Henderson hails Firmino.