CHICAGO -- It's difficult to know how far Myles Jack will fall in the 2016 NFL Draft, but he's not waiting around to find out.
The former UCLA star linebacker, invited to Chicago this week among 24 other prospects with a strong chance to be chosen in the first round, has left the Windy City, according to NFL Media Insider Ian Rapoport. It's not uncommon for prospects invited to Chicago to leave before the second round if undrafted in the first round. New York Giants safety Landon Collins, for instance, was among those to do so at last year's draft.
Collins was the first pick of the second round, No. 33 overall, in 2015.
Jack wasn't that lucky. His draft stock plummeted in the wake of news that his surgically repaired right knee could require potentially complicated microfracture surgery at some point later in his career, threatening his longevity as a pro. He acknowledged the possibility of the procedure on Wednesday. On Friday, Dr. James Andrews told Jack that he doesn't need microfracture, according to ESPN.
Jack is expected to be ready to play as a rookie.
The former Bruins star tore his meniscus at a UCLA practice in September. He withdrew from school to focus on rehabilitation and announced his intention to enter the draft as an underclassman. Six months later, however, he had missed the NFL Scouting Combine, had only limited participation in UCLA's pro day, and scrapped a plan to hold a personal pro day at which he was expected to run his first 40-yard dash for NFL scouts.
Following his medical recheck in Indianapolis on April 15, Rapoport reported NFL clubs had mixed opinions about Jack's knee.