Phil Foden and Jack Grealish have been warned over their conduct by manager Pep Guardiola after they were left out of Manchester City's win over Newcastle on Sunday.
The England pair were pictured on a night out after City's 7-0 home win over Leeds five days earlier.
Speaking after the 4-0 win at St James' Park Guardiola hinted that Foden and Grealish had not been rested.
"I pay a lot of attention to behaviour on and off the pitch," he said.
Speaking to BBC Radio 5 Live, he added: "And when off the pitch is not proper they are not going to play.