The Eagles listed Foles' return as questionable.
Foles got the start Thursday because No. 1 quarterback Carson Wentz continues to work up to full speed after last season's torn ACL.
The Patriots beat the Eagles, 37-20 Thursday night in preseason game No. 2.
Foles also addressed his handshake with Brady after the game.
Coach Doug Pederson said Foles will be evaluated Friday.
After forcing a quick three and out, the Patriots' offense and Tom Brady took the field and set the tone for the rest of the game.
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That leaves the Eagles with Foles, Nate Sudfeld and Joe Callahan on their QB depth chart.
We were presented with this same question last week and I picked the same player, which means the rookie is doing exactly what Bill Belichick wants to see in stacking good performances together.
Not surprisingly, though, some observers made at least a little deal out of a pregame moment Thursday, when Brady strode across the field at Gillette Stadium in Foxborough, Mass., to shake the hand of the opposing quarterback.
"I was getting ready to throw a deep ball and it got grabbed as I was following on through so it sort of got a little strained", Foles said, per NJ.com. "It feels pretty good", Foles said postgame.
"I don't think you could ask any more of a teammate than what James provides us and the trust that everyone has in him", Brady said, comparing him to past Patriots part-time backs like Kevin Faulk, Shane Vereen and Danny Woodhead.