Not only Barcelona because all the teams who play in the Champions League also expect the title they can get but the extent of the team's strength in competing for the title. Both Barcelona, Manchester City and Real Madrid will both struggle to get the best results in the Champions League but a number of other teams are also promising because in the transfer market they have brought a number of players to make the team stronger. PSG also tries to maintain the title even though it looks not easy because competition will be far more competitive next season.
It’s worth mentioning that besides PSG wanting to defend their title, there are also Liverpool, Arsenal, and Bayern Munich. These are very strong teams as well, and they will definitely want to compete for the Champions League trophy. All the teams are very strong, and for now, it’s hard for me to pick a single favorite. I see that Real Madrid worked well in the transfer market. Additionally, Militao and Carvajal have already returned to play, and Mbappe will be back very soon. So Real Madrid could be a very formidable opponent this season.