Mendy tagged himself at Hong Kong International Airport on Instagram on Friday, prompting a journalist to ask Guardiola about it during the press conference. He returned against Burton Albion in the League Cup but suffered a set-back, putting him back on the sideline.
Mendy cleared up the issue on Twitter, insisting it was a joke.
"Wow, I didn't know", Guardiola said, per the Manchester Evening News.
"Injuries like this, you can't just start training and stay fit".
After posting a selfie to his Instagram story with the location tag set for Paseo de Gracia in Barclona on Thursday afternoon, the defender posted another selfie video of himself in a auto on Friday morning, alongside a driver, this time with the location tag set for Hong Kong International Airport.
"Before he went he said "I'm going one day to Paris", and that's OK because that's here, but Hong Kong is far away, so I don't know".
Mendy's since responded to Guardiola's words and it's typically brilliant. I didn't know it. F***, he's a lucky guy!
Meanwhile, Guardiola rejected suggestions that Liverpool are feeling the pressure after back-toback draws saw them drop below City at the top of the table. Guardiola also responded to Aleksander Ceferin after Uefa's president claimed City lacked class for failing to attend a meeting this week regarding VAR.
"I had tickets to go but the Premier League chose to put the game at Everton then".
Earlier today, Mendy posted a story tagging himself in Hong Kong.