ALLEN PARK -- Snacks Harrison suited up for his second Lions practice on Friday, and intrigue is building over whether he'll be ready to make his Detroit debut on Sunday against the Seahawks.

"It's always a good question," coach Matt Patricia said before practice. "When you get guys that come in the building, (you have to) understand that you have to look at it from their perspective. They walk into a building one day, and the next thing you know, a couple hours later, they're in a different building. That's a pretty hard transition to make. It's obviously a lot to deal with in a very short amount of time, so we're just trying to do the best we can to go through the process.

"The good thing for us is we have a couple days here. We'll do the best we can to get him up to speed and we'll see what it looks like for the game."

It helps that Harrison, acquired in a trade with the Giants on Wednesday, is a seventh-year veteran. It also helps that he has experience anchoring both 3-4 and 4-3 fronts, since Detroit uses both looks under Patricia. And he also hails from a Giants system that shares a lot of similarities with the one Patricia has installed in Detroit.

Another former Giants front seven player, Romeo Okwara, was picked up the week of the opener. He didn't play against the Jets a few days later, but was in the starting lineup the following week and has played well immediately. He has four sacks, second most on the team.

But is two days of practice really enough for Harrison?

"I think the best advantage he would have is he's actually been coached by a couple guys that I've worked with in the past," Patricia said. "So, some of that terminology, concepts, technique, things like that will be a little bit familiar to him once he sorts through everything. There should be, hopefully, a quick transition with that and the technique part of it, so hopefully that will transfer."

The Lions could certainly use Harrison against Seattle, which gets downhill fast in the running game and is averaging 127.8 yards per game on the ground. That's seventh in the league.

If Harrison can't go, the Lions will continue to roll with Ricky Jean Francois, Da'Shawn Hand and A'Shawn Robinson on the interior of their defensive front.

Ezekiel Ansah (shoulder), Darius Slay (toe) and Jarrad Davis (calf) also were practicing Friday. The only player not participating was running back Theo Riddick (knee). He's expected to miss his second straight game because of the injury.