Stoke City boss Mark Robins says that while his side has seen massive improvement in defence this season, none of his players have yet hit "their top level."
The Potters currently possess the joint-best defensive record in the Championship this season, alongside Middlesbrough, conceding just eight goals across their opening 12 games.
Just seven sides let in more goals last season than Stoke's 62.
"We are trying to improve all the time," Robins told BBC Radio Stoke.
"If we continue in the same vein, then we will improve and will keep getting better and close to the goal - the ultimate goal of being at the top of the division at the end of the season rather than talking about it after 12 games.