Man City were held at Villa Park on Saturday night.
The Cityzens drew 1-1 against struggling Aston Villa and has lost Kyle Walker to an injury on that afternoon.
“He had to be substituted because he had some problems in the first half,” Guardiola said. “He continued but at the end he could not continue.
“We will see (how he is). I didn’t speak with the doctors.”
Guardiola explains what to expect when they visit Sevilla on Tuesday night for their round-of-16 Champions League tie.
“Normally I am a positive person in general,” Guardiola said to the season ahead of the Group G opener.
“In general you analyse every game, the performance. We have dropped four points so far and now we have the Champions League.
“Every game away is difficult in the Premier League – Newcastle, today – I know how difficult it is and the opponents are really good.
“The titles we won in the past were difficult and this will be no exception.