Moses and Omeruo, who have had different loan spells since joining the Blues but Mikel Obi has been a first team member since 2006.
Omeruo was on loan at Kasimpasa last season while Moses spent last season on loan at West Ham.
It is however believed that new Chelsea boss Antonio Conte is actually looking to keep the trio and give them a chance to show what they can do for the first team.
Nigeria captain Mikel has been linked with Chinese and Turkish clubs, but it remains to be seen if he will end his 10-year association with the London side or stay put for another season.
Chelsea finished the 2015/16 in 10th place with 50 points from 38 matches.