"Close to home in Slovakia, knows guys on the team and has played in Prague before so he is comfortable there," his agent Matt Keator said via email.
The 35-year-old Chara also played in Prague for HC Sparta as a junior player in 1995-96. He finished last season with a career-high 52 points after helping the Bruins win the Stanley Cup in 2010-11 with a 44-point campaign.
Chara becomes the eight Bruins player to join a foreign team for the lockout , joining Tyler Seguin (Switzerland), Dennis Seidenberg (Germany), Tuukka Rask, David Krejci and Andrew Ference (Czech Republic), Anton Khudobin (Russia) and Rich Peverley (Finland).
Information from ESPNBoston.com’s James Murphy was used in this report.