Sources say Urlacher’s had more than 1 surgery this year.

Per “Moon” Mullin of CSN:

Mullin cites two NFL sources as saying that Urlacher had surgery shortly after suffering a knee injury in the regular-season finale on January 1. It had previously been reported that Urlacher had opted for rest and rehabilitation instead of surgery.

And one source told Mullin that Urlacher actually had another procedure in the spring.