Nets head coach Steve Nash told reporters after Wednesday's practice that Green could return as early as Game 4 of the second-round playoff series Sunday. When asked when Harden might be able to return, though, Nash said he couldn't "set a time on it yet."
"He's progressing nicely as well," Nash said of Harden, who also missed Game 2. "So we're optimistic that we can have him back at some point."
Harden played 43 seconds in the Nets' first game against the Bucks last week before suffering a hamstring injury. In the opening quarter, he drove toward the basket and attempted to lob a pass over Bucks guard Jrue Holiday and center Brook Lopez.
After lobbing the ball, Harden landed and immediately grabbed at his right hamstring. Shortly later, Brooklyn called a timeout, and the 31-year-old guard retreated to the Nets' locker room.
The Nets later said Harden was diagnosed with "right hamstring tightness." Nash said Harden's MRI revealed no structural damage.
During the regular season, Harden missed more than a month because of a right hamstring strain.
Green, meanwhile, has been hobbled since straining his left plantar fascia in Game 2 of the Nets' first-round series against the Boston Celtics. On Wednesday, he said he has been dealing with the foot issue all season.
The Nets, who hold a 2-0 series lead, are scheduled to face the Bucks on Thursday night at Fiserv Forum in Milwaukee.