"Quarterback Joe Flacco had a breakout 2010 season for the Baltimore Ravens, but he might have to find two new targets.

Ravens coach John Harbaugh isn't sure if wide receivers T.J. Houshmandzadeh and Donte' Stallworth will be back with the team next season.

Harbaugh made the comments Wednesday night during a conference call with 6,000 season-ticket holders.

"You can't really put a percentage basis on it because there are so many things up in the air at this time," Harbaugh said of the chance the receivers will return, according to the Ravens' official website. "There are obviously a lot of issues that haven't been a part of the equation in the past. It's just a different calendar now with free agency."

Houshmandzadeh, 33, and Stallworth, 30, each signed one-year contracts with the Ravens last offseason. Both will be unrestricted free agents when a new collective bargaining agreement agreement is reached, and both have said they'd like to return to Baltimore.

Houshmandzadeh had 30 receptions for 398 yards last season, his lowest numbers since he was a rookie with the Cincinnati Bengals in 2001. Stallworth finished with just two receptions for 82 yards after missing the 2009 season because of an NFL-mandated suspension related to him pleading guilty to DUI manslaughter."