Cosart (elbow) cleared waivers and elected to become a free agent Monday.
Cosart (elbow) was transferred to the 60-day disabled list Thursday.
Cosart underwent arthroscopic surgery on his right elbow this week and will be out for the remainder of the season, Dennis Lin of The San Diego Union-Tribune reports.
Cosart (elbow) received a PRP injection Wednesday and will head to extended spring training to begin his rehab process, AJ Cassavell of MLB.com reports.
Cosart was placed on the 10-day disabled list Tuesday with a strained right elbow.
Cosart (0-2) allowed nine baserunners and three runs over four innings Sunday. He struck out five in a 3-1 loss to the Rockies.
Cosart allowed two runs on three hits while walking five and striking out two over four innings for a no-decision in Monday's 5-2 win over the Cubs.
Cosart (foot) was confirmed as the starting pitcher for Monday's game against the Cubs, Bob Scanlan of Fox Sports San Diego reports.
Cosart is day-to-day after X-rays on his foot came back negative Wednesday, Dennis Lin of The San Diego Union-Tribune reports.
Cosart allowed one run on five hits and a walk over five innings Thursday against Milwaukee. He struck out three.