"We are working on it.
"In my opinion, it has become over-complicated. Effectively, we are trying to work with four parties; the player, West Ham, the company who own Carlos' economic rights and the Premier League in order to sort it out.
"The process is ongoing. The player will have a medical at some point this week, then we will take it from there.
"We still have to sort out the paperwork but we are confident that can be achieved in the course of the next week or so."