Adrien Silva is now training with Leicester while the Premier League club consider going to the Court of Arbitration for Sport over his transfer saga.
The Foxes' appeal to FIFA to secure the registration of Portuguese midfielder Silva was last week rejected by world football's governing body.
Leicester and the Football Association had asked FIFA to ratify the transfer after the paperwork for Silva's £22million deadline day move from Sporting Lisbon was submitted 14 seconds late.
That request was denied and, as things stand, the 28-year-old will now not be registered to play for Craig Shakespeare's team until January. However, Silva is now being properly integrated into the group.
"I can thankfully report he is training with us," said Leicester boss Shakespeare, whose side resume their Premier League campaign at home to West Brom on Monday night.
"Obviously we are disappointed with the decision by FIFA and the other processes are in the hands of the club.
"But he is training with us and I speak to him on regular basis during training to make sure he's fully focused on what his requirements are.
"Ultimately he's a footballer and he wants to play football and train and he's had to miss out not only on club football but international football and we've tried to keep his spirits up.
"The camaraderie and the banter is brilliant in and around the changing rooms and I wanted to integrate him as quickly as possible and I can do that now. He's out on the training pitch now which is great for him and great for me.
"Behind-closed-doors friendlies are something I will look at as regards his fitness. I will talk with Adrien and the club about which way to go forward.
"It would be remiss of me not to plan for the worst case scenario, which is that we don't have him until January. In terms of his fitness we will have a plan in place - and we will probably have a Plan A, B, C, D, E and F so it's some thing that we will continue to monitor."
Asked about the possibility of taking the case to the Court of Arbitration for Sport, Shakespeare said: "I think it's under review. I will leave it in the hands of the club because it's still a can of worms for someone like me who is just football based, not knowing all the ins and outs.
"I think I will wait for the club to come back to me and I'm sure the club are reviewing what the options are and until they have reviewed them I will make sure myself and Adrien concentrate on the coaching on the training pitch."