That plan appears to be on hold for now.
Ramirez, who is eligible to return to the A's on Wednesday, does not appear to be ready to join the big league ballclub yet. The A's manager feels the same way, according to John Shea of the San Francisco Chronicle:
Melvin seems to think Manny won't join A's Wednesday unless he drives a couple of balls in next couple of days.— John Shea (@JohnSheaHey) May 27, 2012
It does not seem that Ramirez is ready to get back to the big leagues anyways, based on what he is doing in Triple-A Sacramento. He is only hitting .240 in 27 games and has not had an extra-base hit yet.
The A's can use any pop they can get, but it does not seem that Ramirez is ready to provide it at this time. He will likely spend more time in the minors and will return when he begins to hit more than singles.
The A's signed him with the hope that he might find his power swing and be a productive part of their lineup. Until he shows that he can be a contributor, he will be in Sacramento trying to prove his eligibility.