Semedo in, Kolarov out could make it work with the foreign spots. That could be a case of Kolarov leaving the club, or just being omitted from the CL squad and playing domestically where Sané and Jesus still count as u21.
I don't think it's ideal but I'd like to think they're looking at alternatives in case Levy is uncooperative. The man has a reputation for being unpredictable and sometimes unreasonable, so even if they were confident everything on the player's side was tied down, they should be prepared for it to go south.