Bar Canaletes reports Argentine midfielder Palacios, 25, is on the radar.
Palacios was more or less a regular for Bayer Leverkusen during this season's title winning campaign.
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In total, the Argentine dominated with four goals and four assists in 24 games, of which 21 was from the start, in the Bundesliga.
Bayer requires at least 40 million euros to sell the midfielder.
Palacio's contract with Bayer Leverkusen runs until the summer of 2028.