Feeley missed practice again on Thursday because of a rib injury he aggravated during Sunday night's victory over the Cleveland Browns.
When Feeley went out for one play against the Browns, Rosenfels attempted his first pass of the season after calling an audible at the line of scrimmage. The pass fell incomplete.
Approaching the end of his fourth NFL season, Rosenfels has attempted only 10 career passes, completing 4 of them. All his completions came in mop-up duty at the end of a 31-7 loss at Tennessee last year when he went 4-for-6 in relief of Brian Griese.
Against Baltimore, Rosenfels might be handicapped by the absence of starting wide receiver Marty Booker, who hasn't practiced so far this week.
Booker is listed as doubtful because of an ankle injury.
In addition, third receiver Derrius Thompson also is banged up, meaning there could be extended playing time for the likes of Bryan Gilmore, Maurice Mann, kick returner Wes Welker and Ronald Bellamy, who was signed off the practice squad earlier this week.