Barcelona have confirmed they have the option to purchase Yannick Carrasco as part of the deal that saw Memphis Depay join Atletico Madrid.
Atleti announced the signing of Depay on Friday on a two-and-a-half-year deal after Diego Simeone's side agreed to pay Barca €3million up front with a possible €1m in add-ons.
LaLiga leaders Barca included a non-compulsory purchase option for Atletico winger Carrasco, who is in his seventh season as an Atleti player, either side of a short stint in China.
Reports from Spain suggest Barcelona will have to hand over €20m should they wish to sign the 29-year-old Belgium international.
Carrasco has played in 23 of Atletico's 26 games this season, 15 of those starts, and has the fifth-most goal involvements with five – four goals of his own and one assist.
Atleti have already allowed Joao Felix to join Chelsea on loan for the rest of the season during the January transfer window, while Matheus Cunha made the switch to Wolves.