While reports are spreading about Rey Mysterio's intentions for 2018 when his Lucha Underground contract expires, he may not have as many options as he was hoping for. While he has had discussions with Global Force Wrestling, those talks were primarily to create leverage to maximize any potential deal with WWE, which is where those close to Mysterio say he prefers to end up.
Mysterio's talks with GFW are being handled by current GFW manager Konnan, who is acting as Mysterio's real life manager. However, attempts to reach out to WWE were met by very little enthusiasm as WWE has had bad experiences with Konnan in the past and have no interest in dealing with him in any negotiations with Rey Mysterio.
If Mysterio is serious about returning to WWE, he may have to drop Konnan as his representation. As one source in WWE said on the condition of anonymity, "There's no way Vince McMahon is going to negotiate through Konnan. It's a non-starter."