"But I think Joseph being made captain at Derby County not so long ago gave him a lot of confidence.
"He stepped up to it when people were out. He understands that he has got a big part to play at the club.
"Hopefully there is more to come. He has been here five years with us now and I remember saying when he first came here that central defenders get better with age and the more experience they get.
"He is doing a good job at the moment."