The Norway international was taken off at half-time against Fulham after picking up a knock, and his condition is now being monitored on a daily basis potentially boosting Arsenal in the Premier League title race.
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Haaland had scored in the Citizens’ previous two games, including a vital goal at Liverpool, but failed to reappear after the break against Fulham.
Guardiola confirmed the substitution was precautionary after Haaland reported first-half discomfort, and admitted the issue remains unresolved.
"Erling’s not 100 per cent," the manager told reporters.
"It’s not a big issue, the doctor said to me. But had some disturbance before and during the game and that’s why second half he didn’t play.
"We will see his evolution."