"He has been able to train after the problem with the back".
And Sarri, who has used the England worldwide sparingly so far this season, hailed the impact of the attacking midfielder. Physically, technically, he is improving tactically.
Hudson-Odoi continued his eye-catching Europa League campaign with a goal and an assist at the Olympic Stadium, and Sarri was encouraged by the 18-year-old's display - while sounding a familiar note of caution.
Chelsea boss Maurizio Sarri believes Ruben Loftus-Cheek has what it takes to become "one of the best midfielders in Europe".More news: Facebook Reveals Reason For Widespread Service Outage
More news: Fortnite Just Made a Big Change to Battle Royale Matchmaking
More news: New Zealand doctors move clinics outside in bid to stop measles' spread
Teenager Hudson-Odoi got on the score sheet before the final whistle, using his speed to outrun the Dynamo defence on the counter and easily beat Boyko to make it five goals on the night for Chelsea.
"It's a mad one because a young English player at Chelsea at that age then you really want him to sign that long-term contract. I am really very happy for him and for the hat-trick, and I am really very happy with him".
The Premier League side will now await Friday's draw to see who they will face in the quarterfinals, with a spot in the Champions League on offer for the victor of the second-tier European continental tournament.
A hat trick from Olivier Giroud, along with strikes from Marcos Alonso and Callum Hudson-Odoi, built on Chelsea's 3-0 victory over the same opponents at Stamford Bridge last week to book their place in the last eight with an 8-0 aggregate win.
'And second, it means that Naples are in the final, and I am happy. "So, for me, it will be very hard to play against them in Naples".