They didn't play many match on the world cup I think it was just three but Alonso isn't really that mean to him in the extent of not wanting to play him regular or at least starting ones on the matches, so actually Alonso did started with him on there first match against AI Hilal, Rodrygo was there number 11 on that day having Garcia and Vinicius with him on the forward but that was his last time of starting any matches but I understand why Alonso did that but he actually tried because even if Rodrygo might not be at the first but there isn't any matches he did not put him.
Real Madrid went as far as the Semi final in the club world cup and by contrast that way above 3 matches. Round 16, Quarter finals and semi final that's a total of 6 matches they played in the competition. You were right when you said he started the game against Al Hilal and that was his only start in the competition the two other games in the group stage against Pachuca and Salzburg he came in as a substitute which is not that bad but after that I don't think I saw him again. Well he might not fit into the coaches plans.
You are right because it seems I made a mistake on the number of matches I said they played so is true that they played total of 6, there group stage was 3 while the final stage was also three making up the number above and they didn't loss any apart from there first on the semi finals. After he appeared on all the match on the group stage he didn't appear almost although there last stage because with Juventus they didn't play him but on the Borussia Dortmund they brought him again but not from the starting but as substitutes then with PSG being there last on the league he wasn't in.