Colts quarterback Andrew Luck was listed as questionable Friday for Indy's showdown with New England on Sunday night.
The Colts said on Monday that Luck, who missed the last two games with a sore right shoulder, had returned to full participation at practice. But Luck only did limited work for the last three days.
If Luck doesn't play this week, backup quarterback Matt Hasselbeck will likely make his third straight start after leading the Colts to wins over Houston last week and Jacksonville the week before.
Sunday's meeting between the Colts and Patriots is the first since New England beat Indy 45-7 in the AFC Championship in January.