Christian Pulisic is reportedly considering leaving Chelsea on loan in January.
Pulisic has been frustrated by a lack of playing time under Frank Lampard.
Pulisic has been an unused substitute in three of Chelsea's last four matches.
"He is working hard and sometimes we know that the manager has to make decisions but I see him working hard in training. From here all I can say is to encourage him to keep working because we know that a new country, a new team, a bit of time of adaptation,” said Cesar Azpilicueta.