Even with three catchers already on the 40-man roster including six-time All-Star Buster Posey and top prospect Joey Bart, the Giants continued their quest to add depth to the group Monday with the signing of veteran Curt Casali. The Giants announced they agreed to terms on a one-year, $1.5 million deal with Casali, a seven-year major league veteran who spent the past three seasons with the Cincinnati Reds.