According to Henry Schulman of the San Francisco Chronicle, Giants phenom Buster Posey may get the call to the Big Leagues soon. It’s been widely believed that Posey has been kept in the Minor Leagues until at least June so he’ll be under team control and be salary arbitration ineligible for an extra year.

Schulman’s source says that Posey probably won’t be with the Big League club at the earliest until their next home stand when the team faces the Padres and the Astros in mid-May.

The Giants had an opportunity to bring the youngster with them after Spring Training broke, but they felt that he would benefit from consistent at-bats at Triple-A. Another theory is that the Giants do not want to promote Posey until he is ready to stay with the Big League club, but Schulman believes that theory holds no water.

PRO Rumors theory is that the Giants have not scheduled a bobblehead day in 2010 for Posey, so the Giant’s marketing department is putting a lot of pressure on the front office from promoting the phenom.

Posey currently is hitting .353 with one home run in 68 at-bats at Triple-A Fresno.