Haaland, who captained City for the first time in a Premier League game against the Carabao Cup finalists, went down clutching his knee in the final stages of the 4-0 win at the Etihad.

The 25-year-old appeared to jar his right knee unchallenged before falling to the ground in clear discomfort, but after a period of treatment, Haaland was able to walk off the pitch before watching the rest of the game from the substitutes' bench.

Erling Haaland went down with injury during Man City's Premier League win against Newcastle. 

"When he went down, everyone was scared," Guardiola said. "But he walked off smiling and the doctor didn't tell me bad news so hopefully he is fine.

"I have not spoken to the doctor. Maybe it's not bad as it could be." City must overturn a 3-2 first-leg deficit against Real in the Santiago Bernabéu to reach the round of 16.