Allen missed practice Saturday, but the Celtics said he was back with the team for its flight to Miami and should be available to play against the Heat on Sunday night in the opener of Boston's four-game road trip.
Allen went to the hospital to be with his son, Walker, after Friday night's victory over the Raptors.
Walker Allen, now 2½ years old, was diagnosed with diabetes during the 2008 NBA Finals and the family found out shortly before Game 5. After losing that contest in Los Angeles, Ray Allen rushed to be with his son at the hospital, before scoring 26 points in a lopsided Game 6 victory in Boston that helped the Celtics raise banner No. 17.
Information from The Associated Press and ESPNBoston.com's Chris Forsberg was used in this report.