Kalas was involved in Chelsea's pre-season International Champions Cup, however the centre-back has no place in Sarri's plans and will spend his third consecutive season out on loan from Stamford Bridge.
August 23, 2018
Kalas joined Chelsea in 2010 but has played just a handful of games for the 'Blues' and joins his sixth different loan club with Bristol City.
Manager Lee Johnson told the club's website how happy he was to capture a player of such high calibre.
"Tomas' signing shows the ambition that Bristol City have because there was a lot of interest and we beat a number of Championship and top European clubs to get him.
"The experience Tomas brings to this football club will be invaluable and I am really looking forward to working with him.
"He has already proven himself at Championship level and I have no doubts that he can help us in our bid to reach new heights," Johnson added.
City have previously had a number of players on loan from Chelsea and were keen to extend the link between the two clubs.
"We are delighted to have furthered the relationship we have had with Chelsea over the last few years with the signings of Tammy Abraham, Jay Dasilva and now Tomas," CEO Mark Ashton also stated.