Talks between the two clubs have intensified as City look to gain a decisive advantage and avoid a late scramble from rival suitors, while Manchester City's hierarchy are also in active discussions with Bouaddi's representatives to finalise personal terms.
The 18-year-old Morocco international, whose form for club and country over the past year has drawn attention from across the continent, featured in every game but one of Morocco's run to the World Cup quarter-finals, including a standout display against Brazil, before his side were eliminated by France.
City are understood to be the best-placed of several leading European clubs, including Arsenal, Liverpool, Manchester United, Real Madrid and Paris Saint-Germain, to secure his signature this summer.
Lille's ownership are prepared to sell provided the fee meets their valuation, reported to be around €100m, and negotiations are said to have entered a decisive phase, with those close to the player viewing a move to the Premier League favourably.
City want the deal wrapped up within days to strengthen a midfield already reshaped this summer following the club-record signing of Elliot Anderson for £116m, with Bouaddi's arrival intended to provide both immediate depth and a long-term platform for the club's rebuild, particularly given Rodri's advancing talks over a return to Spain.
Sporting director Hugo Viana has made the move a priority, with City determined to have the transfer finalised well before it becomes a battle with their rivals for the teenager's signature.
Rodri, who captained Spain to World Cup glory this summer and was named player of the tournament, is understood to have already agreed personal terms with Real Madrid, with only the fee between the two clubs still to be resolved.
Should that move go through, Bouaddi and Anderson would together represent an outlay of more than £200m on rebuilding City's midfield in a single window, one of the clearest signals yet of the scale of the project Enzo Maresca and Viana are undertaking at the Etihad this summer.