Phillips was an early second-half introduction after Rodri's dismissal.
“He played really good today," said Guardiola.
“For the type of game that we needed, defensively and keeping the ball and run, he was amazing.
“I'm so pleased for him because he's an incredible guy, never one bad face when he didn't play the minutes.
“I know he's a player for the national team of England, and with me, with us he doesn't play much. But he played really good and helped us a lot.
“I know sometimes he struggles for some things that we need, in small spaces to be quicker, and other ones has another type of quality.
“But in the game today, what we needed, to be there, to win the second-balls, to keep the balls, to make actions to the by-line, the personality in long balls, even in the corners, because we knew it with a lot of crosses in the way they play, he gave us a lot."