Sporting head coach Silas refused to deny whether an agreement is in place for Bruno Fernandes to leave the Portuguese club amid links to Manchester United.
Sporting captain Fernandes is reportedly nearing a move to United after officials from the two clubs are said to have been in talks on Friday.
Fernandes was linked to United, Premier League rivals Tottenham and La Liga giants Real Madrid at the start of the season, but a transfer did not materialise as the Portugal international eventually signed a new contract in November.