The former News of the World editor and his agency, Phil Hall Associates, have been brought in by Garry Cook, who started at the club earlier this month.
Cook has spent more than a decade with sporting giant Nike, latterly as president of the Michael Jordan brand, based in America.
Phil Hall Associates will 'help Cook acclimatise to life back in the UK and with a major Premiership football club', according to agency account manager Stuart Skinner.
Under new chairman Cook, Man City is currently attempting what The Guardian this week called 'the most amazing transfer coup of the summer'.
The club has offered Brazilian footballer Ronaldinho a record-breaking £18m to move from Barcelona - a deal that would work out at roughly £200,000 per week.
Hall has experience brokering such high-profile sporting stories to the tabloids, having worked with well-known teams and managers before.
Skinner added that Hall was currently 'in talks with another football league club to do their PR'.
The agency already handles communications for FA Cup winners Portsmouth (PRWeek, 22 May), and Hall had been consulting with Chelsea FC manager Avram Grant prior to his sacking last month.