Sporting CP coach Marcel Keizer hopes not to lose midfielder Bruno Fernandes.
The 24-year-old Portugal international revealed his desire to play in England earlier this week amid interest from Manchester United.
When asked about a possible departure of Fernandes, Keizer told Sport TV: "A player of his quality cannot be replaced.
"If it were up to me, the market would close, it's good enough for me. But all the teams are waiting to see what happens with respect to new players and possible transfers.
Sporting wants to keep the best but we are not in a position to keep all of our players and something will happen but I do hope they can stay."
