Will be tough to move on from Stones. He's at about 250k/wk and will have a year left after this. Idk if anyone can match his wages given his injury record and he has no incentive to leave.
Ake might be easier to move. On reasonable 160k/wk wages but has a troubling injury history. However just like Stones, it's tricky to replace them because neither takes up a foreign spot on the team.
Akanji is also on a lucrative 180k/wk wages per reports. He's the most durable of the 3 CBs but again he might not have a reason to leave a sporting project such as City's in his prime. 2 years left after this year.