"Benjamin Mendy is injured and it's not easy".
A shock to Guardiola who thought he was in Paris.
Guardiola added: "Wow I didn't know that".
Mendy, who is now injured, posted an Instagram story of himself in a auto with the location set at Hong Kong Airport on Friday morning, having posted images of himself in Barcelona just a day earlier.
"Well before he said, "I'm going to Paris for one day", but Hong Kong is far away".
I don't know, I have to get Instagram because I don't know, really I don't know.
Guardiola, who praised Sarri's work at Napoli when City met the Italian side in the Champions League last season, says he could see a different Chelsea as far back as August in the Community Shield.
Mendy had been in Barcelona on Thursday for assessment on his knee, on which he underwent surgery in November, with City's preferred specialist Dr Ramon Cugat.
The left-back has become known for his playful use of social media and the location on his Instagram story on Friday suggested he was at Hong Kong International Airport.
The 24-year-old is now sidelined with a knee injury and Guardiola confirmed in his pre-match press conference ahead of Manchester City's game with Chelsea on Sunday that the World Cup victor would not be involved in the game.
'A few days ago, the gap was seven points and now we're in this position, ' said Guardiola. "Yesterday he was in Barcelona".
Mendy eventually responded by saying he was just playing a prank and was actually still in Spain.
But his latest activity on social media was close to landing him in trouble with Guardiola once again. "I dont want no problems, Pep".
He appeared as a second-half substitute in City's Carabao Cup semi-final second leg win over Burton on January 23 but has missed the last four games as his comeback is carefully managed.