By JOEL SHERMAN

Alex Rodriguez will hold a news conference tomorrow at 1:30 p.m. to address his involvement with steroids.

The press conference will be held in the same large party area that Andy Pettitte held his news conference last year to discuss his HGH use.

Brian Cashman and Joe Girardi are certain to attend the A-Rod session, just as they did last year for Pettitte. Jorge Posada told the Post last week that he and the main veterans on the team, including Pettitte, Derek Jeter and Mariano Rivera also want to attend the news conference, as long as they have A-Rod’s blessing to do so.