ALLEN PARK, Mich. -- Defensive end Ziggy Ansah, the Detroit Lions' first-round pick in 2013, likely will be activated from the physically unable to perform list in the near future.

The Lions placed Ansah on PUP at the start of training camp as he continued to recover from a February shoulder surgery. During camp, Ansah regularly worked on the sideline with a trainer, and he did his most extensive work Monday.

"He's making good progress," coach Jim Caldwell said. "I mean, they're ramping up his activities in terms of his rehab. I think as you watch him out here, he's doing more and more and more each day. He's getting close, so we'll see what happens."

Caldwell did not say whether Ansah would be available for the exhibition opener Saturday against the Cleveland Browns at Ford Field.

Ansah led all rookies with eight sacks last season, and if he is healthy, he will start this season at "open end" in coordinator Teryl Austin's new defense.

During his work with a trainer, Ansah wore a brace on his left shoulder. He did some work with his hands to simulate engaging a blocker and also tested his shoulders individually.