Real Madrid have what could be a tough Copa del Rey test ahead in the form of Celta Vigo.
Los Blancos have had a miserable La Liga campaign this season, at least by their incredibly high standards.
Madrid sit third in the table, 16 points behind first-place Barcelona. With such a massive mountain to climb, it's doubtful that the club will be able to make it consecutive La Liga titles.
Thus, the Spanish Cup offers Real Madrid the only chance for a domestic title the rest of the season.
The club isn't exactly on peak form right now. In addition, Madrid comes in already up against it, having lost the first leg, 2-1, in Vigo.
Here are three Celta Vigo players who could make the Copa del Rey fixture extremely difficult for Madrid.
The Spanish forward leads Celta Vigo with eight La Liga goals.
The question going into the season was to how he would adjust to the first division of Spanish football. Aspas lit up the Segunda Division, scoring 23 goals in 35 games.
He had a rather quiet time in the first leg, and didn't manage to get a shot off whereas his substitute, Cristian Bustos, scored Celta's second goal.
If Celta Vigo are to get on the scoresheet this time around, Aspas will likely have something to do with it.
It was at Euro 2012 that Michael Krohn-Dehli got noticed by many world football fans.
After spending four seasons with Brondby, Krohn-Dehli moved to Celta Vigo this past summer.
He doesn't offer much in the way of scoring goals. In 257 games at the international and domestic levels, Krohn-Dehli has only scored 40 goals.
His best asset though, is his distribution on the wing. In those 257 games, Krohn-Dehli has notched 59 assists.
It was Krohn-Dehli who assisted on Mario Bermejo's goal to make it 1-0 in favor of Celta in the first leg.
All the attacking in the world won't help Celta goalkeeper Sergio Alvarez has a poor game. Sergio did very well in the first leg.
Each time Madrid made an attempt on goal, Sergio was equal to the task. There was too much going for Madrid, as Cristiano Ronaldo's goal in the 88th minute would attest.
It's unfair to expect Sergio to keep a clean sheet against Los Blancos, especially in the Santiago Bernabeu. His task then, will be to ensure that Madrid only manage a goal or two.
If he plays like he did in the first leg, Celta could be looking at a massive upset.