The Ravens expect Flacco to return to practice in the preseason.
The team added that the plan is for Flacco to be the starting quarterback against Cincinnati in the regular season opener on September 10.
The team said Flacco was re-examined and his "progress from a back issue is good".
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The Ravens released a statement saying, "The team now has a more definitive timeframe for QB Joe Flacco's return".
Flacco will not participate in the preseason; given the possibility of aggravating his back injury, that's probably a smart move.
Still, its a good sign that both players are back on the field with plenty of time before Baltimore's next preseason game against the Miami Dolphins on August 17.
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In his nine National Football League seasons, Flacco has only missed six games, which all came after his ACL tear toward the end of 2015. Every time he's hit, there will be some nervous moments.
Mallett completed nine of 18 passes for 58 yards, but Ravens fans are surely hoping they won't have to see the seven-year veteran journeyman on the field for the start of the 2017 season.
There will be a question of how sharp Flacco can be right away. There's a chance he could be rusty early on.
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Flacco is entering his 10th season in Baltimore and completed a career-high 64.9 percent of his passes for 4,317 yards in 2016.