The Celtics guard returned to Boston Friday after posting $150,000 bond and traveled with the team for Saturday's preseason game against New Jersey at the Mohegan Sun in Uncasville, Conn.
Allen told The Boston Globe he is "very confident" he will be vindicated on an aggravated battery charge.
"I'll let God and my lawyer take care of everything," Allen told the paper.
''I just feel that I let my team down, by getting into this situation."
Allen remains sidelined as he rehabs from offseason surgery on his right knee.
Allen was charged by police late Thursday night in connection with an Aug. 28 incident in which a man was shot. He is not a suspect in the shooting, but police allege Allen was involved in a fight, during which a man's eye socket was broken. Both the shooting victim, Marktwain Johnson, and victim of the punch, Nigel Odum, are seeking money from Allen and have filed civil suits against Allen.
Allen now faces charges of aggravated assault, which carries a penalty ranging from probation to a five-year prison sentence. He must return to Chicago for a preliminary hearing Wednesday, the Globe reported.
Allen was drafted by the Celtics 25th overall in 2004 and started 34 games as a rookie. He averaged 6.4 points and 2.9 rebounds.
Information from The Associated Press was used in this report.