Leeds United have been heavily linked with a move for Red Bull Salzburg midfielder Brenden Aaronson this month.
The Whites launched an improved £20m offer for the 21-year-old last week as Marcelo Bielsa aims to strengthen his squad ahead of the remainder of the season.
However, Aaronson has joined up with USA for three World Cup qualifiers over the two weeks, which could make a deal hard to come by before January 31.