Ex-Chelsea winger Pat Nevin has raised concerns about the use of defender Levi Colwill.
The Blues youth product was impressive at Brighton on loan last season - as a center half.
However, Mauricio Pochettino has used Colwill as a left-back in the majority of games this season.
After a 1-0 loss to Middlesbrough in the Carabao Cup semi final first leg away from home, Nevin told BBC Radio 5 Live: "It did not have to be anything complicated.
Get it over the top of the Chelsea defenders and Isaiah Jones will run on to it.
When he got to the byline he did not panic and that was the difference between him and the Chelsea players.
Jones was doing it time and time again, he was a consistent danger.
Do Chelsea play Levi Colwill at left-back again? There are a few questions for Chelsea."
