Leeds United are busy preparing a bid for young Portuguese centre-back Diogo Monteiro.
The prospect has emerged as coach Jesse Marsch's priority for a defensive signing after securing Max Wober.
Monteiro is highly rated and plays for Servette in Switzerland.
The Athletic are reporting that Leeds are not resting on their laurels this winter.
The club know they must strengthen to stay in the Premier League, and are now moving onto signing Monteiro.
Leeds have been impressed with recent signing Wilfried Gnonto from FC Zurich.