#1 Thibaut Courtois (Chelsea)
The issue with goalkeeping has haunted Real Madrid the most since the start of this season. The absence of a stellar option in between the posts is one of the crucial reasons why Real Madrid have fallen miles behind Barcelona and Atletico Madrid right now.
Adding to their woes, Los Blancos have already failed to sign Bilbao shot-stopper Kepa Arrizabagala this winter. In the present circumstances, Courtois can prove to be just the right man to replace Keylor Navas this season.
The Belgian has already been linked with a move to the Bernabeu and reportedly Real president, Florentino Perez is ready to offer Raphael Varane to sweeten the deal. Courtois has kept 12 clean sheets in 23 league games for Chelsea and conceded just 16 goals.
Real Madrid crashed out of the Copa Del Rey and look far from winning the league this season. Adding to that, they have been paired with Paris Saint Germain in the Champions League - the only competition they can hope to win this season.
With the prospect of facing mighty forwards like Edinson Cavani and Neymar in mind, signing Thibaut Courtois should be their top priority before the transfer window slams shut.