Espanyol coach Ernesto Valverde will fight against the sale of any of his star players during the winter market.
Dani Jarque, Albert Riera and Luis Garcia have all been linked with moves to the Premiership during January, but Valverde says: "They are key players for us.
"One thing is that there are no players available in December so we wouldn't be able to replace them. If we are up where we are it is because we have good players that we must maintain."