Manager Roberto Mancini is keen to reinforce an increasingly vulnerable rearguard that has conceded eight goals in four games.
Goal.com UK understands that City are closely monitoring the situations of long-term targets Luiz and Van der Wiel.
“Mancini isn’t finished this month,” a City source told Goal.com UK. “City have been watching Luiz for a year and have remained in regular contact with his representatives. They are also interested in Van der Wiel and are considering a last-minute deal.”