Which undrafted rookies have a shot to stick?

Tom Telesco & Co. earned mostly glowing reviews for their debut draft. But the work they did bringing in undrafted free agents afterwards was equally impressive. We run down some of the top undrafted additions and examine which of them have a chance to crack the 53-man roster.

San Diego's two biggest undrafted additions -- in terms of size and potential impact -- are nose tackles Byron Jerideau (South Carolina) and Kwame Geathers (Georgia). These signings were key as the Chargers have just one true nose tackle on their roster (Cam Thomas) after releasing Antonio Garay and losing Aubrayo Franklin as a free agent.

Jerideau (6-foot-0, 334 lbs.) is a run-stuffer with the strength to push opposing interior linemen into the backfield. He finished his senior season with 40 total tackles, five tackles for loss, 2.5 sacks and a blocked kick. But his game is not about stats -- he excels at occupying blockers and keeping his playmakers clean. He could win a spot in the rotation and make life easier for Donald Butler and Manti Te'o.

If Jerideau does not win a roster spot, it is likely because he was beaten by Geathers. A massive man at 6-foot-5 and 342 lbs., Geather carries his weight well and can hold the point of attack when playing with leverage. He uses strong hands to disengage, locate the ball and bring down the ball carrier.

NT Byron Jerideau
On the other side of the ball, the UDFA with the best shot to stick is Virginia Tech OT Nick Becton, if only because he plays the team's most unstable position. He has the size (6-foot-5, 323 lbs.) and agility to play left tackle, but he remains a work in progress, He started 13 games at left tackle in 2012, but was just a rotational player prior to that. His technique and playing strength need further development.

Others to keep an eye on...

--CB Josh Johnson (Purdue) fell because he lacks in speed (4.65 40-yard dash) and size (5-foot-9). But he is strong in man coverage and comes off a strong senior season in which he forced six turnovers (three interceptions, three forced fumbles) and broke up 16 passes. If the Chargers keep five cornerbacks -- and don't add a veteran in the interim -- he could be the guy.

--ILB Dan Molls (Toledo) led the nation in total tackles last season with 166. He diagnoses plays quickly and is always around the football. He lacks the measurables of an impact player, but he has enough grit and want-to to be a No. 4 linebacker and special-teams contributor.

--SS Jahleel Addae (Central Michigan) was a three-time All-MAC selection. A co-captain in 2012, he led his defense with 89 tackles and four interceptions. A former running back, he has exceptional instincts and hands. And as evidenced by his 300-plus career tackles, he is not afraid to hit.

Talk about San Diego's undrafted rookie additions inside the message boards.

Michael Lombardo is a long-time contributor to the Scout.com network. His analysis has been published by the NFL Network, Fox Sports and MySpace Sports. He has followed the Chargers for more than 16 years and covered the team since 2003. You can see more of his updates by following him on twitter.

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