Chelsea boss Frank Lampard feels their wing play can improve.
The manager also wants his players to be louder on the pitch.
"Part of my thinking when Hakim Ziyech comes to the club is the balance of the sides of the pitch which is very important for us," he said ahead of their clash with Sheffield United.
"We knew Reece's quality last year in terms of crossing the ball and when you can have a winger in front of him that offers different angles and combinations on that side to put balls into the box, then it can be a big strength of ours.
"When I say that, don't forget that Azpi has been here for years, making big assists for the club at different times from all sorts of crosses and different angles, so when we look at the sides of the pitch it is something that we want to exploit and we can get better at it.
"At the moment we are getting praise for the sides of the pitch but as we move forward we can get better at it in terms of our execution and finishing in the box as well, but it is something I am happy with and we want to keep working on it."
Lampard also wants his players to be more aggressive in demanding the ball.
"We have made some changes in personnel," he notes. "Thiago Silva is a player who brings an attitude and professionalism that is infectious. The players are growing. At times last year we were a pretty young team and definitely one of the games that is picked out in my mind is Sheffield United at Bramall Lane where they beat us in every department and that hardly happened last year.
"We just have to improve it with the work we do and the way that the squad grows and that is a process, and it is a nice test tomorrow to see where we go."
