Allen (hip) has been ruled out for Monday's game against Toronto with a low-back contusion.
Allen was initially believed to have suffered a right hip injury in Friday's loss to the Bucks, but his injury has since been reclassified. He'll miss his second game in a row, after sitting out Sunday's 102-94 win over the Pistons. Robin Lopez is expected to pick up another start in the frontcourt in Allen's stead.