“Khalil Mack Watch” continued Thursday at Halas Hall with curious reporters wondering how the Bears defense might respond if Mack’s injured right ankle keeps him out of Sunday’s game against the Patriots or significantly limits him.

“I don’t know the situation,” linebacker Danny Trevathan said. “But I know that if he’s ready to go, he’s going to go. And I know the defense is going to be prepared either way to win another game. We’re going to step it up anyway.

“He’s going to handle his business. He’s a pro. He’s one of the best at it. And we have to keep moving. He knows that. We know that. The defense has to get this win.”

Mack missed practice for the second consecutive day Thursday.

Still, even with coach Matt Nagy saying Mack’s health situation is a “day-to-day” deal, there’s an internal optimism that the outside linebacker will be able to play.

Mack never has missed a regular-season game in his NFL career, a streak of 69 games that he hopes to keep going with the Patriots visiting Soldier Field on Sunday.

Fangio was asked before Thursday’s practice whether Mack would have a chance to play even if he wasn’t able to practice during the week.

Said Fangio: “Not having been around him for a whole lot of time, I don’t really know the answer to that. But I think so.”

Wide receiver Allen Robinson also missed practice Thursday with a groin injury. Nagy said Robinson felt the injury during Sunday’s game against the Dolphins and that the Bears were being cautious. Cornerbacks Prince Amukamara and Marcus Cooper, who have hamstring injuries, and offensive lineman Eric Kush (neck) were limited.

“(Amukamara) looked good, and for us that’s important,” Nagy said. “He’s a great player for us. He’s a leader and has experience, so we were glad to see that.”

Fuller house: Lost in a sloppy defensive effort for the Bears during Sunday’s 31-28 overtime loss to the Dolphins was a two-interception day from veteran cornerback Kyle Fuller. Fuller’s two picks lifted the team interception total to 10 after just five games. That’s monumental progress after the Bears made only eight interceptions in each of the last three seasons.

Fuller’s first pick against the Dolphins came on a deep ball from Brock Osweiler to DeVante Parker late in the first half, a pass the Bears cornerback had to make an athletic catch on. Early in the second half, Fuller struck again. Playing off coverage against Albert Wilson, Fuller read the receiver’s route and anticipated Osweiler’s read to make another big play. Fuller returned that pick 35 yards to the Dolphins 12 to set up an easy touchdown drive for the Bears offense.

“He saw the route, saw the quarterback and made a great break and a great catch on the ball,” Fangio said.

“It was a great play. His two interceptions were great plays. Some of the time on interceptions you get a tipped ball or kind of easy plays. His were two really, really good plays.”

Chicago Tribune’s Colleen Kane contributed.

dwiederer@chicagotribune.com

Twitter @danwiederer