Thanks for the link to the resources!
I was thinking about the extra team slot, and I realized that you can edit the PES/WE teams, so that is an additional 3 teams. That will make deciding a little easier, but not by much. I could add 3 of the missing CL teams, but that would leave one out. Instead, I was thinking of adding teams whose country is not currently represented by a club team. This being a US patch, I think the US should be represented with at least one or two teams. Those would most likely be LA Galaxy and Houston Dynamo. But I would also consider Chicago Fire, New York Red Bulls, or DC United. But there are also plenty of other teams from Brazil and Argentina which would fit in. Sao Paulo, Palmeiras, Boca Juniors.
If it were up to me alone, I would put in the following.
LA Galaxy -> replaces PES or WE team
Houston Dynamo -> replaces PES or WE team
Boca Juniors -> Empty Bundesliga spot
Let's hear what you think,
-Perfect Form