The German worldwide winger was taken off at half-time after a much-criticised challenge from Cardiff's Joe Bennett.
The German youngster was subbed off at half-time during Sunday's win after a heavy challenge from Joe Bennett who was eventually dismissed, Guardiola showed concern early on post-match and it seems that the Catalan's worst fears have been realised.
"They dished it out a bit, they had one or two naughty tackles", Warnock said.
"But I was disappointed he got sent off at the end - obviously he doesn't want to go to Leeds next weekend, because it was an absolutely pathetic challenge when on booking. You have to be ruthless and obviously they got their goals".
- Following Kevin De Bruyne's opener, Manchester City now have five players to have scored at least 10 goals in all competitions this season, more than any other English league side (Sergio Aguero, Raheem Sterling, Leroy Sane, Gabriel Jesus and De Bruyne). [Callum] Paterson came through well, Liam [Feeney] did well when he came on. Quite a few risky challenges in the Bundesliga have escaped fair punishment despite the use of the VAR this season, and not enough appears to be being done in terms of concussion protocol.
"I thought Ken [Zohore] is getting back to himself, so if we could sign another striker this week..."
City's attacking movements and link up play was sensational in the first half and it was in the first 45 minutes itself that the result of the game was seemingly decided. 'I have supported the club my whole life and didn't think I'd see that day.
"Hey, Cardiff City Just letting you know, we have a really important tournament in the summer".
After revealing German worldwide Sane is set to be out for a month, Guardiola said: "The only thing they have to do is protect the players".