MDG founder Miguel De Godoy claims to be currently advising the centre-right candidate 'on a personal and unofficial basis,' however is understood to be on the verge of formalising the arrangement.
MDG will replace Nueva Comunicación, which handled Macri's campaign in the mayoralty elections when he was beaten by the current head of government Anibal Ibarra.
Newspaper La Nación recently erroneously reported that Roberto Starke, a partner at Nueva and former adviser to Macri's ally, Ricardo López Murphy, would be working on Macri's campaign.
De Godoy advised former president Fernando de la Rúa when he was senator, before becoming head of government for the city and taking over the presidency in 1999. Since then MDG has worked for private clients including hypermarket chain Carrefour and McDonald's.