Roos was sent to AHL Belleville on Saturday.
Roos was recalled by the Senators on Thursday.
Roos penned a one-year, two-way contract with Ottawa on Tuesday.
Roos did not receive a qualifying offer from Chicago and will become an unrestricted free agent Monday, Ben Pope of the Chicago Sun-Times reports.
Roos was called up from AHL Rockford on Monday, Tracey Myers of NHL.com reports.
Roos was loaned to AHL Rockford on Sunday, per Charlie Roumeliotis of NBC Sports Chicago.
Roos was recalled from AHL Rockford on Thursday, according to Scott Powers of The Athletic.
Roos was assigned to AHL Rockford on Monday.
Roos was reassigned to AHL Rockford on Sunday, per Charlie Roumeliotis of NBC Sports Chicago.
Roos was promoted from AHL Rockford on Thursday, Ben Pope of the Chicago Sun-Times reports.