Rafael Benitez has told Valencia they are guilty of an illegal approach for Milan Baros if their claim to have had talks with Liverpool striker are true.
Reds boss Benitez was reacting to Valencia president Juan Soler, who says he has opened negotiations with Baros.
"It is illegal to talk to a player with two more years of his contract to go," said Benitez.
"I prefer not to talk about these things and I need to discuss this with people at this club."
He added: "But the situation is that he is our player and has two more years of his contract with this club still to go.
"I am not worried about Baros. If what their president has said is true maybe it is time to ask them about the situation."
Baros, 23, was the leading scorer at Euro 2004 but has struggled this season and scored 13 goals for the Reds.
"He has scored a lot of goals during the season," said Benitez. "After his injury problem he is scoring less goals but he is working hard."
Soler had earlier told Radio 9: "We are negotiating with the Czech (Baros) and with four or five players of the same quality.
"These players are from Europe and South America and we are trying to do things in plenty of time, both with Baros and with the others."
Benitez led Valencia to the Spanish league title last season before acrimoniously moving to Liverpool last summer.
The Mestella outfit are now challenging for a Champions League place and Soler refused to elaborate on any possible ins and outs.
He added: "Some of the players who are coming are going to replace those who are already here, so it is for the best that we do not speak too much about the subject.
"I don't want the team to lose concentration as we aim for our objective of returning to Europe."