If there is one player whose determination to prove himself at Chelsea cannot be questioned it is Mykhailo Mudryk.
Behind the scenes, the Ukraine winger is putting in so much work that some of his team-mates say they have never seen anything like it.
'He is trying so hard, it is like he is in the gym every hour of the day,' said one source.
Those who have followed Mudryk's career describe the gym as 'his favourite pastime,' following in the footsteps of one of his idols, Cristiano Ronaldo.
Outside of his Chelsea sessions, Mudryk has been working with personal trainer Dima Chapovskyi on strength and speed work, including his ability to reach top gear from a standing start, in an effort to make him as quick as possible.