Per the UT's Michael Gehlken, the San Diego Chargers have signed undrafted free agent center Khalil Wilkes. Nick McDonald was signed by the Chargers in January but had to be released to create space on the 90-man for Wilkes.
Wilkes is reportedly 6'3", 285 pounds and was a second team, All PAC 12 honoree at Stanford. If the name sounds familiar, it's probably because he was one of the tryout players that attended rookie minicamp in May for the Chargers.
Wilkes is unlikely to make the final 53-man roster as he represents the most recently added of 15 offensive linemen and is at best the 3rd-string center behind Nick Hardwick and Rich Ohrnberger. Fellow rookie Chris Watt is also capable of snapping the football and has the benefit of being a drafted player.
This is a bit of a nothing move relative to the 2014-15 season, but Wilkes could theoretically have a future with the team as a practice squad player.