"It's true that if Salvio's arrival is confirmed we will have too many non-EU players," he told a news conference.
"We know that and we are in discussions about it and we'll have to make a decision."
Salvio's club, Lanus, said this week they had accepted Atletico's offer of 8 million euros and As sports daily reported on Saturday he would arrive in Madrid on Monday to finalise the deal.
The paper also said Atletico planned to offload Brazilian midfielder Cleber Santana to make room for Salvio.
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