Inter couldn't win against Monterrey. Inter's squad is completely stronger than Monterrey's, but they are in disarray. Of course, this is a very normal situation, they lost the champions league and they lost the championship in the league. After conceding the first goal, they equalized in the first half but couldn't find the winning goal. Inter have the potential to finish comfortably 1st in this group, but if they continue to play like this we won't even see them 2nd.
Inter players have really lost confidence, Inzaghi is gone, the players have nothing to fight for, many players have to be discarded and a bad performance against a team like Monterrey alone shows that Inter is in a situation that needs to be saved. If they continue like this playing in the League next season it seems they will not be a threat anymore.