Sporting Lisbon president Bruno de Carvalho has warned Premier League clubs off their stars.
The likes of Diego Capel, Rui Patricio and William Carvalho have all been heavily linked with clubs in England - including Liverpool, Manchester United and Chelsea.
De Carvalho told A Bola: "The club has decided that there will be no sales in January.
"The club is leading the division for the first time in nine years and we are determined to fight for the title.
"Only if a ridiculous offer is put in for a player will it be studied."
