The Ghana international joined the Blues in 2013 but is yet to make a first-team appearance for them.
He is currently on loan at Championship side Newcastle, which is his fifth spell away from Stamford Bridge.
John Terry sitting with Chelsea fans at Burnley
Sun, February 12, 2017
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John Terry sat with the Chelsea away fans at Burnley
The 25-year-old revealed he has spoken to Chelsea boss Antonio Conte and acknowledged his hopes of displacing the likes of Eden Hazard, Willian and Pedro will be "difficult".
And Atsu says his focus is on impressing with the Magpies and helping them get back to the Premier League.
"It is difficult for me and Chelsea – you can see the kind of wingers they have," Atsu said.
Christian Atsu is on loan at Newcastle
"I have to keep working hard. I spoke with Conte. He is a good manager, very serious in his work.
"I need to keep fighting for Newcastle and do well here.
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"I will be very happy if Chelsea win the Premier League and Newcastle get promoted."