From an arcticle in July 19th 2014:
The San Francisco 49ers have a need at inside linebacker due to NaVorro Bowman's injury, but as an undrafted guy coming onto the team, Skov finds himself behind six other inside linebackers, counting Bowman. He's behind Michael Wilhoite, the guy who will likely fill in for Bowman, Chris Borland, the guy the 49ers drafted in the third round this offseason, Nick Moody, the guy who was drafted last season and Blake Costanzo, a special teams ace.
Personally, I liked Skov a lot more than Borland heading into the draft, and I was shocked when Skov didn't get drafted. Skov was noted as one of the best players who did not get drafted though, which is why I was excited to see him come to San Francisco. He had debilitating knee injuries over the course of his college career, but he seems to have mostly shaken those off and looked good last season.
Skov finished the 2013 season with 109 tackles, 13 tackles for loss and 5.5 sacks, good enough to make him a third-team AP All-American. That was with Stanford, which is notable since he did play under both Jim Harbaugh and Vic Fangio while there.
So here's what we have: a very productive linebacker who sustained serious injuries in college and was banged up this offseason. Now, while the odds are stacked against him, I don't think Skov is totally unable to earn a roster spot this season. Borland and Wilhoite are pretty much guaranteed in my mind, given the draft status and experience. But Bowman's injury means the 49ers will keep an extra inside linebacker, and that's Skov's chance.
Basically, Skov will have to beat out Moody above all else, and then he'll have to show enough special teams ability and upside to get the nod over Costanzo. It's a daunting task, but he's a very talented player.
http://www.ninersnation.com/2014/7/19/5900765/49ers-roster-2014-shayne-skov-90-in-90