In addition to McCovey, right fielder Hunter Pence has lent his name to help support the effort.
The recommended donation is $50, the cost of enabling one child to participate in the Junior Giants program throughout the summer.
Those giving $50 will receive a Pence bobblehead that features the diving catch that preserved Tim Lincecum's 2013 no-hitter at San Diego. Other rewards are given for higher donations, including a baseball autographed by McCovey and Pence ($440), a Pence-autographed bat ($1,500), a McCovey-autographed jersey ($4,400) and a meet-and-greet session with McCovey ($10,000).
To make a donation, visit jrgiants.org.
Chris Haft is a reporter for MLB.com. Read his blog, Haft-Baked Ideas, and follow him on Twitter at @sfgiantsbeat. Ryan Hood is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.