United were strongly linked with the 16-year-old last month but were unable to get a deal over the line for the Englishman, who has scored four Championship goals in 26 appearances this season.
The Red Devils are expected to revive their interest this summer, but according to The Sun, City are preparing to go head-to-head with their bitter rivals for the youngster.
The report claims that Citizens boss Pep Guardiola sent scouts to watch Bellingham in action against Coventry City in the FA Cup on Tuesday as the English champions line up a summer bid.
The academy product, who is thought to still be on a youth wage of £145 a week, will see his current deal at St Andrew's expire in the summer of 2021.
Arsenal, Real Madrid, Barcelona and Borussia Dortmund are also said to be monitoring his progress. body check tags ::