Tottenham's move for Paris Saint-Germain winger Lucas Moura is finely balanced as the clubs haggle over a £22million fee.
Lucas last played for Brazil in 2016 and Tottenham would need to apply for a work permit as part of any transfer.
Negotiations are expected to pick up on Monday but with the window closing on Wednesday, there are concerns time could be against them.
The 25-year-old had permission to visit Tottenham's Enfield training ground on Thursday and was suitably impressed by their set-up to want to join.