Atletico Madrid are threatening Swansea City's deal for Las Palmas midfielder Roque Mesa.
Swansea have tabled a €13 million offer for Mesa this week, but Atletico are ready to go higher.
AS says Atletico are willing to bid €15 million and are edging ahead in the race for the midfielder.
Atletico coach Diego Simeone is pushing to sign Mesa as a replacement for Tiago and the injured Augusto Fernandez.
For the moment, Las Palmas are playing it cool, with Mesa's deal carrying a €30 million buyout clause.