The left-handed Norberto was one of five more players added to the widening Biogenesis report Tuesday night, along with Padres shortstop Everth Cabrera, Astros outfielder Fernando Martinez, Padres reliever Fautino De Los Santos -- who once played for the A's -- and top Mets outfield prospect Cesar Puello. This just a few weeks after more than a dozen players, including A's right-hander Bartolo Colon, were linked to the clinic.
Major League Baseball is currently investigating the clinic. In the meantime, the A's have no comment regarding the situation.
Norberto, 26, posted a 2.77 ERA in 39 games for Oakland during a 2012 season that was interrupted by shoulder issues. Now healthy, the southpaw has already thrown to hitters this week and is tentatively scheduled to pitch in Monday's game against the Indians.
"The trainers have given him a full go and he's felt good," manager Bob Melvin said Wednesday. "So at this point there are no limitations."