ALLEN PARK — It’s too early to know if the Lions will have to make a move for an offensive tackle this week.

Right tackle Corey Hilliard sustained a knee injury in Sunday’s loss to the Bengals. Coach Jim Schwartz said it’s not a day-to-day type injury, but also it’s not long-term.

Left tackle Riley Reiff left the game, but was able to return once Hilliard was out.

“He was limited when he did return, but he was able to return,’’ Schwartz said. “I kept a close eye on the sideline to make sure it wasn’t a situation he was going to hurt himself or the team. He was doing his job, I think that’s a little bit encouraging.’’

Jason Fox has missed the last two games with a knee injury and has not practiced during that time.

“He’s improving we’ll see where he is. We could potentially be forced to make something. It’s too soon to tell,’’ Schwartz said.

Rookie LaAdrian Waddle filled in first at left tackle for Reiff, then at right tackle for Hilliard. If Reiff could not have returned, Dylan Gandy would have filled in at tackle.

Cornerback Rashean Mathis, who hasn’t missed a game, has been fighting a nagging groin injury for a few weeks and wasn’t able to finish Sunday’s game. 

“He’s no worse for wear. He really stepped in and did a nice job, he went as long as he could and was able to get us into the fourth quarter,’’ Schwartz said. “That was positive.’’

Reggie Bush finished the game but afterward said his neck hurt. Schwartz said a lot of guys get stingers during a game. Bush did an appearance at a Detroit elementary school Monday.

Calvin Johnson, who played in just half the game a week ago, was on the field for 91 percent of the offensive snaps.

Schwartz said he was sure Johnson was sore after the game but no more than the other 45 Lions who played.

“He wasn’t Calvin yesterday, he was Megatron yesterday,’’ Schwartz said.

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