I agree with you that Lazio would win against Juventus when they play on Saturday at Lazio's home. Since Juventus lost the Italy Serie A title race to Inter Milan, Juventus has not been consistent in the league, and because of that, AC Milan overtook Juventus to occupy the second position in the Italy Serie A table.
This could indeed happen again to Juventus this week, although this is something that Juventus fans don't want at the moment. Because, however, Juventus will also continue to fight to win this match in order to no longer lose its position in third place, even though this will not immediately disappear for Juventus if it really loses to the home team Lazio. However, it will still be very important to maintain it because the match has not yet started and Juventus itself can still improve itself from now on.
This match to be played tomorrow is very important. It is of great importance because Lazio is focused on moving up. Their form has been terrible lately and they are focused on taking it to the next level. I can say that Juventus also experienced similar problems. Juventus will play all its trump cards to win this match, but I think Lazio has a great advantage to get 3 points with its crowd advantage.