Yes, and it's also problematic because each one of the City loanees will take an international spot. If the actual rules are anything like Football Manager, we only get 8.No they can't. It's like the Premier League. You can only use players who are registered as part of your squad.
You're going to want to use most of those for guys who are going to be here long-term, in my view, so if I'm building a team to win MLS, I'm very cautious with taking on too many City loanees.