I just checked the table to see that Juventus is on 5th position with 37 points, two points behind Lazio. Since Juventus is a strong club, they will likely overtake Lazio with time, because I don't think that Lazio will be able to maintain the 4th position till the end of the season. Perhaps, the fourth position is open for the clubs on 4th-8th position on the table currently due to little point difference.
To be honest, I don't think Juventus will finish in the top four in Seria A this season. They were busy with their unbeaten league record and even failed to win against a weak club that would have given them more league points. Two points separate Juventus from Lazio, but we're not sure if they'll keep winning after Napoli broke their unbeaten record. Lazio, on the other hand, is capable of maintaining the position until the end of the season, but let's wait to see which team will take over the position at the end.
For me, Juventus still has a big chance to finish in the top four of Serie A this season because the points difference with other teams is not too far. I am sure Thiago Motta will make changes to improve the current situation in order to finish in the top four this season because if Juventus fails to qualify for the Champions League next season, Thiago Motta will most likely be fired.