Chelsea are considering a double bid for Nathan Aké and Raheem Sterling from Manchester City.
The Blues are being linked to Sterling as they look to refresh their attack.
Now The Telegraph states they are considering bringing Ake back to the club, five years after he left them permanently.
The source states such an arrangement would tempt City, given Ake is only a squad player under manager Pep Guardiola.
Chelsea are on the hunt for multiple defenders after the free transfer losses of Antonio Rudiger and Andreas Christensen.
They are being linked to a host of defenders, including Sevilla's Jules Kounde.