Blagojevich has been indicted on federal corruption charges. Adams says he will be seated at the defense table if the case goes to trial. Blagojevich must name his attorneys at a June 1 hearing.
Sheldon Sorosky, a long-time Blagojevich friend, had been the ousted governor's only lawyer at court appearances in recent weeks.
Adam gained the spotlight at the trial of R&B singer R. Kelly.
He delivered the thundering, whispering, fist-pounding closing argument at Kelly's child pornography trial. The R&B singer was acquitted of all charges.
Adam is the son of Sam Adam -- a wisecracking veteran of decades in Chicago's criminal courts.
The Associated Press contributed to this report.