The Latics manager denies suggestions that the 29-year-old was in attendance at their FA Cup third-round replay and says that his focus is on players already at the club
The striker missed his own club's replay at Birmingham that night because of illness but, when asked if the Argentine had attended at the game at Dean Court, the Spaniard was unsure.
"I don't think so," Martinez told reporters. "If he was, I didn't know about it.
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"I will never go into a position of mentioning names of other players that are involved with other football clubs.
"I don't think it is respectful. I don't like it when people do it about our players in the middle of a season and I would never do that."
Wigan have already made additions in the January transfer window, including Honduras international Roger Espinoza and Manchester United striker Angelo Henriquez on loan, but admits that they will try to bring in another defender after losing Ivan Ramis until the end of the season with a knee injury.
"We have got a little bit of room to bring one or two players," he added. "I spoke with the chairman yesterday and the injury to Ivan has put us in that situation."