Midfielder Thomas Partey reportedly has a release clause of £43m in his Atletico Madrid contract.
Thomas has been with Atletico since 2012, representing the club's B team between 2013 and 2015 before stepping into the senior side.
The 25-year-old has made 131 appearances for the Madrid giants in all competitions, scoring 11 times and providing 10 assists.
According to Marca, Thomas has a release clause of £43m in his current Atletico deal, which is expected to spark a host of interest in this summer's transfer window.
City are currently searching for a long-term replacement for Fernandinho.