The Chargers made a roster move on Sunday.
Los Angeles signed quarterback K.J. Costello, the team announced.
During the pre-draft process, the team met with Costello. Soon after, he attended their rookie minicamp in May.
With Justin Herbert, Chase Daniel and Easton Stick on the roster, L.A. likely made the move to offer competition for a practice squad spot (assuming two quarterbacks make the final 53-man roster).
Costello finished a four-year career between Stanford and Mississippi State with a completion percentage of 62.9%, 7,434 passing yards, 55 touchdowns and 29 interceptions.