A shock to Guardiola who thought he was in Paris.
The Manchester City left-back posted his location on Instagram as being at Hong Kong worldwide airport and when this was put to Guardiola, whose press conference was being broadcast on Sky Sports, the manager signalled his confusion by swearing.
Wow, I didn't know. I didn't know it. F***, he's a lucky guy!
It remains to be seen what Guardiola makes of Mendy's latest Instagram post but he certainly seemed put out when he was told he could be in Hong Kong, by appearing to swear in front of Sky Sports' live cameras.
"Every time I am with my phone I am on Instagram or Twitter and [so] now I need to be careful", the left-back said.
The reporter then informed Guardiola his player had posted that he was in Hong Kong.
Video shows train leave with baby on board but not dad
CCTV footage from the Greater Cleveland Regional Transit Authority in OH captured the incident which happened on 12 January. According to a police statement, the father was accused of acting "menacing" towards the train operator after the fact.
"Yesterday he was in Barcelona. I'll have to install Instagram".
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.
In response to a tweet from City Watch which transcribed Pep's comments, Mendy tweeted: "It was just joking with my uber driver I dont want no problems Pep".
"Tomorrow they play before us and I think things are going to change", the City boss said.
Highlights from Manchester City's win over Everton in the Premier League.
"But then you count leagues, Barca, Juventus, Bayern, but I'm pretty sure you understand my answer better".