Guardiola looked stunned after a 2-1 defeat at Leicester left the champions seven points behind leaders Liverpool whom they face on January 3.
Picking up a cleared Marc Albrighton corner on the right, just outside of the box, the Portuguese defender hit a fine effort through the crowd and past Ederson into the far corner.
The result leaves City third in the table, a point behind Tottenham, who smashed Bournemouth 5-0 at home, and seven adrift of Liverpool, who hammered Newcastle 4-0 as the Premier League went goal insane on Boxing Day.
"As soon as possible we have to try to win again for our mood, our confidence and our desire".
"We are going to miss a little bit of the final pass, the final assist, the last shot and teams are punishing us: [Andros] Townsend [for Palace], today it was another fantastic goal [by Ricardo]".
It was City's second successive Premier League defeat after their shock 3-2 home loss at the hands of Crystal Palace on Saturday.
"Of course we dropped points, that happens, but after that we were always there, which is the most remarkable thing and what I give the most importance".
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It's a good decision to stay in charge of the game, and second half we could do that again. I am completely happy with the result and it is big for us.
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Loftus-Cheek, 22, has only made one Premier League start this season, while he has been given more of a chance in Europe. However, Sarri insists that his star man is happy to be playing more centrally.
"Maybe we don't create many chances but sometimes it is not easy to create a lot with players coming back from injury".
"We are not happy but we try to overcome the situation".
The bookmakers have made Liverpool rather than City title favourites for the first time this season.
Cardiff emerged from their trip to Crystal Palace with a hard-fought 0-0 draw, while Fulham climbed off the bottom of the table despite conceding late on against Wolves at Craven Cottage.
Centre-back John Stones deputised at the weekend, while the more attack-minded Ilkay Gundogan was deployed at the base of the midfield in Leicester.
"One month ago people said [about] Liverpool and before we have three or four games".
"You have to think about how to solve it when you don't have players in a position".