Bubby Brister replaced O'Donnell, and Seattle (2-9) intercepted two of his first six passes.
Foley sustained a knee injury two games ago at Chicago, after having replaced O'Donnell as the starter.
According to Frank Reich, who replaced O'Donnell: "It was a blitz we had to pick up ourselves.
Parcells has no intention of making this a starter-reliever situation, with Foley coming in late to replace O'Donnell, as he has the last two games.
But they didn't sign a veteran to replace O'Donnell.
Foley had replaced O'Donnell as the starting quarterback last season, but soon was out for the season with a knee injury.
Foley replaced O'Donnell as the starting quarterback last season before an injured knee ended his season and O'Donnell returned.
Last season he came into his own only to see his season end with a knee injury once he had replaced O'Donnell.
To replace O'Donnell, he signed the free agent Vinny Testaverde, who had had a checkered career with several mediocre teams.
Things picked up when Glenn Foley replaced O'Donnell, but then Foley's season ended with a knee injury with five games remaining.