Juventus won an eighth consecutive Serie A title in April, which was Allegri's fifth in as many years.
Juve have picked up just three points after securing their eighth straight league title late last month.
Juventus have already wrapped up their eighth consecutive title, and Allegri's fifth in as many years since replacing Antonio Conte in 2014.
The five-time Ballon d'Or winner had been bidding for a sixth Champions League title to add to his four won with Real Madrid and one with Manchester United.
Allegri said he had yet to decide between Argentine forward Dybala and teenager Moise Kean, who has scored six goals in as many games.
The 19-year-old won his first cap for Italy in a friendly last November, but it was his second appearance for the former world champions that has brought him into the spotlight
Allegri can afford to rest Ronaldo thanks to the 18-point lead his unbeaten side have at the top of Serie A ahead of their match with Genoa.
The challenge for Juventus will be to get goals past the tight defence of the reigning Europa League champions.
Allegri's side have lost two European finals in the past four seasons against Barcelona (3-1) in 2015 and Real Madrid (4-1) in 2017.
Juventus eased past bottom club Chievo 3-0 to go nine points clear on top of Serie A.
The pair also scored both in Juventus' 2-0 win over AC Milan before the international break, and Ronaldo's strike was his seventh in as many games in all competitions for his new club.
The Italian champions have 31 points from 11 games -- six points ahead of Inter Milan and Napoli -- with AC Milan in fourth position, a further four points adrift along with Lazio.
Paulo Dybala scored after just 44 seconds, with a Filip Bradaric own-goal accounting for Juventus' second after 39 minutes, two minutes after Joao Pedro had pulled the Sardinians level.
Portuguese superstar Cristiano Ronaldo played a role in all three goals as Massimiliano Allegri's side ensured a maximum 21 points after seven games.
Two-time UEFA Cup winners Parma were declared bankrupt and demoted to the amateur leagues in 2015. Since then they has been rebuilt and renamed as Parma Calcio 1913.