Mikel John Obi is determined to prove himself to Chelsea boss Antonio Conte.
The Nigerian is back in London after winning bronze at the Olympics.
He tweeted:
Back in UK. Now the hard work with #CFC beings. Eleven seasons, eleven trophies, and I'm not done yet. #KTBFFHpic.twitter.com/ZxirUVna91 — Mikel John Obi (@mikel_john_obi) August 24, 2016