Henry Schulman of the San Francisco Chronicle says the Giants are not ready to call up prospect Buster Posey despite the team’s poor offense and the injury to Mark DeRosa.

The team is getting creative with the pieces they have including the possibility of shifting Freddy Sanchez to third base and moving Pablo Sandoval to first.

GM Brian Sabean said the Giants want to promote their future catcher only if Posey is ready and if he will get significant playing time in San Francisco.

As to Posey being ready, Sabean said, “There are a lot of sides to it. He is catching, he is playing first base and he is swinging the bat in a (hitters’) league where it’s tough to evaluate a high average.”

Bengie Molina, the incumbent catcher, is slumping offensively, but is a favorite among the pitching staff including back-to-back Cy Young winner Tim Lincecum.

“Under those circumstances, we can’t see how Posey would immediately fit in as regards to playing time,” Sabean said. “We want an idea that he’s going to get significant time. In this snapshot, it’s not presenting itself yet.”