Nico O'Riley, who's been a revelation since joining the first team, bagged the crucial 84th-minute strike, proving his worth despite being deployed as a left-back.
In just 14 games, the 20-year-old has scored four goals and provided two assists, making City's decision to turn down Chelsea's advances in January look like a masterstroke.
Guardiola was effusive in his praise for the youngster, admitting he's 'so grateful' to have him in the team.
“He's an attacking midfielder, and when you play as a left-back, you can arrive there,” Pep pointed out.
“He always is there. Look at Plymouth and Bournemouth. When you play full-back, you score. Look at Josko before, now him.
“We are so grateful because he’s not a left-back. They have so many tall, strong players. When the take is good and you are tall, you have a chance. They hit the post and then Stefan makes a save.
“They make a good 10 minutes in the second half but then we work hard to find the goal.”