Federation Internationale de Football Association recently refused to grant him global clearance to play but Leicester are now considering whether to lodge an appeal to the Court for Arbitration in Sport, according to the Leicester Mercury.
Adrien Silva's proposed summer move to Leicester missed the transfer deadline by just 14 seconds.
And even the Foxes kitman had a laugh at his expense by handing him the aptly numbered shirt.
But that was denied and now the Foxes are looking at being without Silva until January.
The Foxes had agreed a £22 million deal to bring the 28-year-old to the club from Liga NOS outfit Sporting Lisbon and had settled personal terms with the player, only for Federation Internationale de Football Association to reject the deal after the registration was completed 14 seconds late over the deadline (Sky Sports).
Boss Shakespeare admitted he was disappointed with Fifa's decision but praised Silva's desire to knuckle down and get on with things.
"Obviously I am disappointed with the decision by Federation Internationale de Football Association".
"He wants to play football and train", he is quoted as saying by the BBC. I am still getting to know him, I do not know him 100% yet.
'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'.
'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 worldwide football and we've tried to keep his spirits up.