The France international had been on holiday since completing a medical in England in the middle of July, but the Premier League champions expect him to put pen to paper this week
The Premier League champions are hopeful the defender will land in the north west of England to put pen to paper on Monday, with his current employers ready to announce his departure to the stock exchange.
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The France international had been in Manchester on July 12 to complete his medical and finalize the transfer, but no announcements have since been made by either club.
City mistakenly posted a video interview with the 23-year-old at the end of July, in which he confirmed his medical at Bridgewater hospital, before removing the content from its official website.
But with Mangala now back from his post-World Cup holiday, the club is hopeful it can finally make the signature official and complete its final major piece of transfer business this summer.
Earlier in the window Bacary Sagna arrived on a free transfer from Arsenal, goalkeeper Willy Caballero was brought in from Malaga, and Porto midfielder Fernando signed for €15m.
Manuel Pellegrini's side had tried to sign both Mangala and Fernando in the January transfer window but Porto stood firm, and in the case of the central defender even blocked his rights holders from sanctioning a deal below the club's asking price.