New York ? It’s easy to predict much of what George Mitchell will say: Baseball ignored performance-enhancing drugs for more than a decade, and his investigation repeatedly was slowed by the players’ union.

The names Barry Bonds, Mark McGwire and Jason Giambi are sure to be included in the report, which could be released Thursday, from Mitchell’s 20-month probe of steroid use in baseball. To what extent, that’s harder to guess.

Mitchell’s big news is likely to be what additional names are linked to allegations of drug possession and use, and details documenting the accusations that he’s gathered. That baseball had a culture in which the use of performance-enhancing drugs was permitted is not groundbreaking.

Hired by Bud Selig in March 2006, Mitchell probably will say all sides in baseball, not just the commissioner, allowed the sport’s pharmacology problem to get out of control.

“I think the report will conclude that owners and Selig were not doing anything particularly reprehensible,” former commissioner Fay Vincent said Monday. “They didn’t know enough. There may have been benign neglect, but nothing more than that.”

Mitchell has been given help and documents from Kirk Radomski, the former New York Mets clubhouse attendant who was required to cooperate with the investigation under the terms of his federal agreement last April. Radomski pleaded guilty to illegally distributing steroids, human growth hormone, amphetamines and other drugs to players.

With his cooperation, Mitchell could reveal the blacked-out names contained in the sworn statements of IRS Special Agent Jeff Novitzky attributing statements to Radomski and to former major league pitcher Jason Grimsley. Novitzky has been a key figure in the BALCO investigation that led to the indictment of Bonds on perjury and obstruction of justice charges.

Mitchell also is believed to have received information from the Albany district attorney, who has been investigating a nationwide drug distribution ring. Radomski and the Albany DA are thought to be Mitchell’s best sources for tying players to drug use.

And Jose Canseco, whose 2005 book implicated McGwire, Rafael Palmeiro, Juan Gonzalez and Ivan Rodriguez, has said he spoke with Mitchell.

Throughout the 1980s and 1990s, and especially in the aftermath of the 1994-95 strike, economics, not drugs, most concerned baseball.

During Mitchell’s probe, most players refused to grant access to medical records he requested, according to several of their lawyers and agents. Mitchell was able to get some nonprotected evidence from teams.