Spain's captain has opted against a move to Real Madrid in favour of joining their El Clasico rivals as part of a sensational transfer shift.
The former Atletico Madrid midfielder is now into the final year of his current contract, and despite City's eagerness to keep him at the Etihad Stadium, the 30-year-old wants a return to Spain.
His agent Pablo Barquero has already revealed an update has been delivered to City's hierarchy and his declining of a renewal until 2029 shows his stance over being ready to force through an exit.
As per Marca, Barca have already offered €50M, which has been rejected by City as they value him closer to €70M - despite his contract status.
Barcelona are keen to wrap up a deal before their LaLiga title defence starts on August 23rd, but they will need to reach a quickfire compromise with City, in what could be their final summer transfer move as Atletico Madrid appear ready to stand firm over Julian Alvarez's exit request.