INDIANAPOLIS (AP) — Dwight Freeney spent the first three quarters Sunday night in the Arizona Cardinals backfield.

He was relegated to watching the final 15 minutes from the Colts locker room.

The Colts are hoping Freeney won’t be a spectator this Sunday after hurting his right quadriceps in Indy’s 31-10 victory over the Cardinals. Team officials were trying to get answers Monday about the severity of the injury and how much time, if any, the Colts’ top pass-rusher might miss.

Coach Jim Caldwell declined to provide specifics until he had the test results in hand.

“I know Dwight expressed that he had an injury in a particular area to some of you last night, but we’re going to reserve comments until the results of the MRI come back,” Caldwell said.

After the game, Freeney said he “felt something pop” in his leg.

Caldwell confirmed that the Colts’ career sacks leader had an MRI on Monday, though the results weren’t expected back until later in the day when players and coaches were not available to reporters.

If Freeney does miss time, it would be another blow to a unit already missing three starters and still trying to get accustomed to Larry Coyer’s revamped system.

The Colts (3-0) have been inconsistent on defense. They played reasonably well against the run and made a late stand to preserve a season-opening win over Jacksonville, then couldn’t get off the field in a victory at Miami. Against Arizona, Freeney was the ringleader of a pass rush that constantly harassed two-time MVP Kurt Warner into miscues in what was clearly the defense’s best performance this season.

Losing Freeney, though, would create a huge void.

Coyer spent much of the offseason plotting more movement along the defensive line and more blitz packages to take advantage of the Colts’ speed and the team’s top playmakers, like Freeney.

But former NFL defensive player of the year Bob Sanders still hasn’t practiced and the Colts were missing defensive captain Gary Brackett (sprained left knee) and cornerback Kelvin Hayden (hamstring) on Sunday night. Brackett and Hayden might return against Seattle.

“I’m still day-to-day, there’s a bruise in my knee and right now we’re taking what it gives us,” Brackett said. “I didn’t make the trip because of the flight. This week is another thing, I’m going to try to play. But you have to be smart about it and when you’re healthy enough to go out there and really be productive, that’s when you go back.”

Freeney’s situation is even more uncertain.

Freeney, the NFL sacks leader in 2004, already has four of Indy’s seven sacks this season and leads the team with nine quarterback pressures.

While many thought Freeney was too small, at 6-foot-1, 268 pounds, to hold up against the NFL’s massive tackles when the Colts took him in the first round of the 2002 NFL draft, Freeney has proven his durability.

Since spending his first eight NFL games as a backup, Freeney has missed just 12 of the Colts last 99 games – seven coming in the second half of 2007 when he sustained a season-ending foot injury — and he has played through a series of nagging injuries during his eight NFL seasons.

With or without Freeney, though, the Colts don’t expect much to change.

“They trust one another and give tremendous effort and it does not matter how many injuries we have, they step in and play well,” Caldwell said. “We just expect that next person to step in every single week and do the job. Often times, you find teams that talk about injuries and how they’ll be affected by that and I think there’s a trickle-down effect where guys get that in their mind and think we’re going to have a down game. We don’t do that.”

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