Shaquille O'Neal is keeping his foot on the gas when it comes to Joel Embiid ... continuing to go after the Philadelphia 76ers superstar and saying if he doesn't make some serious changes, he'll never win a championship.
Shaq's blunt assessment came during halftime of the Sixers' matchup with the New York Knicks ... after Embiid put up eight points through two quarters -- all of which came from the free-throw line, as he was 0-3 from the field.
Diesel was clearly unpleased with Embiid's season debut -- especially after the big man expressed his desire to take games off to preserve his health for the playoffs -- and didn't sugarcoat how he felt on the whole situation.