Sevilla are determined to add another striker to their ranks.
"I am not going to talk about players who aren't ours," Castro said.
"From here until the window closes, anything could happen."
The future of Munas Dabbur has been discussed in recent weeks, with Julen Lopetegui not seeming to have put much faith in the Israeli striker.
"He's a Sevilla player, we're happy with him. He's not going to leave," Castro noted.
"We're not going to listen to offers for him and we're not going to listen to them."
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