The veteran receiver told 106.7 The Fan on Wednesday that he's "excited to be a Redskin now."
The deal is for one year, a source told ESPN NFL Insider Adam Schefter.
Stallworth is expected to sign his deal Friday, the first day teams are allowed to finalize free-agent contracts under the labor rules implemented at the end of the NFL lockout.
The 30-year-old Stallworth caught only two passes for 82 yards in eight games with the Baltimore Ravens last season after sitting out much of the year with a broken foot. He was suspended for the entire 2009 season after pleading guilty to DUI manslaughter.
His best season came in 2005, when he caught 70 passes for 945 yards for New Orleans.
Information from The Associated Press was used in this report.