Lamb hurt the shoulder diving for a grounder last week in Chicago and was placed on the 10-day disabled list. He also missed time early in the season with a left shoulder injury.
"We're gonna huddle up over the next couple of days, over the next 48 hours, and figure out what the next best plan is," Diamondbacks manager Torey Lovullo said, adding that the decision would be up to Lamb.
"As I'm learning, there is a conservative route and there is a surgical route," Lovullo said.
If Lamb opts for the conservative rout, there is a chance he could return this season, Lovullo said.