Though Mirer was unlikely to be re-signed by the 49ers, his move across the San Francisco Bay leaves the Niners with no proven backup behind starter Jeff Garcia and only one other quarterback on the roster that has taken an NFL snap.
Mirer, however, never played a snap for the Niners in 2001 after he was beaten out by second-year player Tim Rattay in training camp for the backup job behind Garcia. The Niners cut Mirer on Sept. 4 to save money under the salary cap, but he was re-signed on Oct. 31 after Garcia suffered a tear of the medial collateral ligament in his right knee during an Oct. 28 overtime loss to the Chicago Bears.
Mirer, signed in the summer of 2000 to compete with Garcia for the starter's job, barely lost out in that competition during training camp. But Mirer saw significant playing time in only one game that season, completing 10 of 20 passes for 126 yards in a September loss to Carolina. Those were the only passes Mirer threw during his two years with the Niners.
After Mirer was unimpressive last summer in training camp, the Niners opted to go with the inexperienced Rattay as Garcia's backup. San Francisco signed Kevin Daft as its No. 3 quarterback on Sept. 5 after releasing Mirer, and Daft was waived a week later with the Niners bringing in rookie Ricky Ray for the No. 3 role.
Both moves saved the Niners space under the salary cap. Ray was waived on Oct. 2, and the Niners went nearly a month with just two quarterbacks on their 53-man roster. Rookie receiver Cedrick Wilson was designated for the No. 3 emergency role during that span until Mirer was re-signed.