Boston Celtics All-Star point guard Kyrie Irving did not travel with the team on Monday to Philadelphia and has been ruled out for Tuesday’s Eastern Conference showdown with the new-look Sixers due to a right knee strain.

Irving came up hobbling after stepping awkwardly trying to fight through a screen in the first half of Boston’s loss to the Los Angeles Clippers on Saturday. Irving underwent an MRI Sunday which revealed no structural damage and he’s been deemed day-to-day by the team.

“Kyrie’s not going [to Philadelphia],” said coach Brad Stevens. "I have no idea what that means for Wednesday. Not playing [Tuesday].”

The Celtics host the Detroit Pistons on Wednesday night at TD Garden.