A day after taking a fastball to the helmet, Giants catcher Buster Posey was placed on the seven-day disabled list on Tuesday with concussion symptoms.
Tim Federowicz had his contract purchased from Triple-A Sacramento and the team designated right-handed pitcher Clayton Blackburn for assignment to create room on the 40-man roster.
Posey, who was drilled by a 93 mph fastball from Arizona Diamondbacks starter Taijuan Walker in Monday's home-opening victory, was said to be doing well after the game and had apparently passed initial concussion tests.
But symptoms often take time before they are felt _ second baseman Joe Panik stayed in a game last year after taking a hit to the head and even hit a three-run home run before the concussion effects took hold the next day _ and the Giants are at the very least taking the most cautious approach with Posey.
