The 27-year old Malian defender has been acquired by the Fire in exchange for their natural second round pick in the 2014 MLS SuperDraft and allocation money.
Soumare kicked off his MLS career with Chicago in 2007 and the club were thrilled to have him back after stints in Europe with Boulogne and Karlsruhe.
"We’re excited to have Bakary rejoin the Chicago Fire,” president of soccer operations Javier Leon said in a statement.
"Bakary is a strong, dependable defender with experience in MLS and abroad. His addition to our roster will help us challenge both in MLS and for the Lamar Hunt US Open Cup. We know that Bakary considers Chicago to be his home and we’re happy to welcome him back to the Fire family.”