The Chilean will be presented to media at Carrington, almost four weeks after his appointment was confirmed.
He will be joined by new signing Fernandinho, the Brazilian midfielder bought from Shakhtar Donetsk at a cost to the club of £30million.
Pellegrini met the majority of his squad this week for the start of their pre-season programme.
They travel to South Africa later in the week ahead of friendlies against SuperSport United and AmaZulu FC.
They are also participating in the Barclays Asia Trophy in Hong Kong this month before playing a tournament in Munich and a friendly against Arsenal in Helsinki.
They begin their Premier League campaign against Newcastle on August 17.
Pellegrini, 59, left Malaga to succeed Roberto Mancini at the Etihad Stadium.
Mancini was sacked in the final week of last season after the club surrendered their Premier League title and were surprisingly beaten by Wigan in the FA Cup final.
The high-profile arrivals of Pellegrini and Fernandinho, and Spain winger Jesus Navas from Sevilla for an initial £14.9million, have heralded a summer of change.
City appear to have pulled out of a move for £53million-rated Napoli striker Edinson Cavani and have lost out to Real Madrid for playmaker Isco, but continue to be linked with numerous possible targets.
Former captain Carlos Tevez has also left the club for Juventus amid the changes.