The 49ers signed offensive lineman Andrew Gardner and defensive tackle Leger Douzable, according to Adam Caplan of ESPN.com (on Twitter). 
Gardner, 31, finished out the 2016 season with the Niners. He has been a bit of a journeyman over the years, but he might have an opportunity to stick for a little while in San Francisco. The veteran’s most notable experience came with the Eagles when he started eleven games from 2014-15.
The Gardner addition should give the Niners additional depth while starting guard Joshua Garnett misses time at the start of the season. Originally given a one-month timetable for recovery, doctors have now told Garnett that he will need six weeks to get back on the field.
Douzable, also 31, was a favorite of coach Rex Ryan and wound up playing for him in both New York and Buffalo. He appeared in every game for the Bills last season (including five starts) and had 43 total tackles and 1.5 sacks.
Douzable is a solid player with a great work ethic. Nothing flashy, knows his role. He’ll be a good role model for that D-line.