Kongolo has joined on a six-month-loan
“It is a good standard for me to play at, the pressure of needing to win every week is something I'm looking forward to as we need to do well in the league," he said.
“There were a couple of clubs interested in me because I did well with Manchester City last season but after speaking with Darren Ferguson I was really impressed with his plans.
“It's my first loan spell so I'm excited to see how the club can develop me and I want to be able to help the team as much as I can."
Doncaster have also signed Issam Ben Khemis today to a two-year deal.