Tomas Kalas has joined Bristol City from Chelsea in a club record deal.
The Championship club reportedly paid 8m for Kalas, who made 41 appearances during a successful loan spell at Ashton Gate last season.
Kalas played just four times for Chelsea over a nine-year period.
"We saw last season the qualities he brings and Tomas is exactly the type of player we want to build our team around," Bristol head coach Lee Johnson said.
"Not only is he a fantastic footballer but someone with a winning mentality
"A lot of credit should go to Mark Ashton, Jon Lansdown and the City Board for the hard work in making this happen."
