Chelsea legend Pat Nevin believes Thomas Tuchel can improve the output of Hakim Ziyech.
The Moroccan as not set the world alight since arriving from Ajax last summer.
But Nevin believes Tuchel can turn around Ziyech's form, as he has with Timo Werner and Kai Havertz.
Nevin wrote in his column for the club's official website: "It almost feels like the manager is going through the squad one by one and working on them as 'projects.'
"So he has already ticked off Alonso, Christensen, Callum Hudson-Odoi and possibly now Havertz, while Timo Werner has clearly improved too, so who is next on the list?
"I suspect it will be Hakim Ziyech, who has struggled with injuries and hence has had limited game time, which has in turn affected his match fitness.
"Watching Tuchel so far, I suspect he will not be satisfied until Hakim is also back to his best.
"That will mean another option and another thing to worry about for every other opponent Chelsea have between now and the end of the season, and beyond."
