Real Valladolid duo Toni Villa and Ruben Alcaraz are reportedly on Championship leaders Leeds United's transfer wishlist.
The Whites have already strengthened their promotion-chasing squad with the addition of goalkeeper Kiko Casilla from Real Madrid earlier this week.
According to the Daily Star, boss Marcelo Bielsa may be further backed in the remaining week-and-a-half of the transfer window as Leeds have their eyes on two more players.
Attacking midfielder Villa is tied down to Valladolid until 2021 and central midfielder Alcaraz's contract runs through until 2022.
The report suggests that Leeds will have to buy out both players' contracts, however, totalling £20m, as the La Liga side are not willing to negotiate a price.
Despite losing three of their last four matches, United are four points clear of third-placed Sheffield United at the top of the Championship.