Gronkowski has yet to feature for the Patriots this season after recovering from back and forearm operations in the off-season, while Amendola hasn't played since the first game of the campaign after injuring his groin.
However, the pair have stepped up their recoveries over the past week and are scheduled to start against the Falcons on Sunday night.
A source told the Boston Globe: "As of today, they are playing. But there is a lot of time between now and Sunday night."
The Patriots are 3-0 in their season going into week four.