City announced in June they would expand their stadium to accommodate more than 55,000 fans and that work would be completed in time for the start of the next Premier League season.
But Ferdinand queried the decision to add further seats to the ground on Twitter on Tuesday.
Ferdinand, watching City's 1-1 UEFA Champions League draw against Roma, posted: "How many empty seats are there at the city vs Roma game by the way....big CL [Champions League] game & fans would rather Ramsays [sic] Kitchen or something at home.
"Expanding the stadium for what though?? For who though???"
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