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The affair involving racist treatment of the 24-year-old footballer reportedly took place during Manchester City's 2-0 loss at Stamford Bridge on Saturday.
Guardiola still took pride in City's performance and urged his side to usurp Jurgen Klopp's men, who took a one-point lead in the title race with a 4-0 win at Bournemouth earlier on Saturday.
N'Golo Kante and David Luiz were on target for Maurizio Sarri's men as City paid for failing to take advantage of their first-half dominance.
Twitter users highlighted a first-half incident when a supporter appeared to abuse Sterling as he retrieved the ball near Chelsea supporters.
Chelsea were unbeaten in their first 12 Premier League games but lost 2-1 at Wolves on Wednesday -- their second defeat in their past three league games.
Chelsea recovered from the disappointment of losing their first match of the Premier League season to Spurs last week to beat Fulham 2-0 and climb to third in the table.
Sunday's hard-fought win lifted Chelsea into third place above Spurs, in action against Arsenal later in the day.
Kante, widely considered the world's best holding midfielder, has a slightly more attacking role in Chelsea's team this season.
With Chelsea stumbling, second-placed Liverpool remain the most likely challengers for City's title after sweeping to a 3-0 win at Watford that keeps them two points behind the leaders.
The 40-year-old Drogba drew curtains to his two-decade-long career on Thursday and a day after he came on a tour to India, raising hopes of thousands of his Indian Chelsea fans.