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Allen Park — When the Lions traded Michael Williams to the New England Patriots, the easiest conclusion to make was the Lions are comfortable with their offensive line depth heading into the 2015 season.

LaAdrian Waddle returned to practice this week, and even though he won’t play in Friday’s exhibition in Jacksonville, his health has provided the Lions with some added confidence about the position.

“He’s obviously making really, really good progress, but there are no guarantees,” Caldwell said. “But the guys that we have in place, that if he’s not able to play, we feel good about their progress that they’re making right now.

“It’s a good group, a talented group, I think, but a couple of them are pretty inexperienced.”

Via the NFL transaction wire, the Lions received a seventh-round pick in 2017 from New England for Williams. Williams was a seventh-round pick in 2013 and converted to offensive tackle from tight end in 2014. He was in line to be the fourth tackle behind Riley Reiff, Waddle and Cornelius Lucas, but had yet to play in a regular-season game.

Now, this year’s seventh-round pick, Corey Robinson, likely will be the fourth tackle on the roster.

“He’s got a huge upside, but it’s just time and experience,” Caldwell said of Robinson. “We like what we see.

“Hopefully, by the time that we call upon him, he’s ready to go.”

jkatzenstein@detroitnews.com

twitter.com/jkatzenstein

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