Jermaine Jackson (R) reacts next to Michael Jackson tribute concert organiser Georg Kindel during a news conference in Vienna September 8, 2009. Artists including R&B stars Mary J. Blige, Akon and Chris Brown as well as veterans Natalie Cole and Sister Sledge will perform at the Vienna Michael Jackson tribute concert later this month, organisers said on Tuesday. Thirteen artists so far have been confirmed to perform at the concert, set in front of Vienna's Schoenbrunn castle on Sept. 26, Michael's brother Jermaine Jackson and producer Georg Kindel told reporters at a news conference in Vienna. REUTERS/Herwig Prammer

R&B singer Chris Brown who was last month sentenced to five years probation and some community service for assaulting his then girlfriend Rihanna in February is not sure whether he will perform at the Michael Jackson tribute show in Austria next week.

Brown will today hear whether he will be allowed to leave the U.S. for the September 26 concert with a judge ruling expected later today.

Michael Jackson's older brother, Jermaine Jackson, said Wednesday he was confident Brown would perform at the tribute concert in Vienna.

Chris Brown is working out some situations but he definitely expressed to us that he wants to be here and it's just up to what he's going through with his court case right now but he's definitely going to work that out and be here, Jermaine Jackson said at a press conference Wednesday in London.