It's been a season to forget for Real Madrid so far.
They're currently sat fourth in the La Liga table and are eight points behind league leaders Barcelona, having already lost five of their opening 16 games of the season. It was assumed that Madrid would struggle to come to terms after selling their talisman Cristiano Ronaldo to Juventus in the summer, however nobody could've anticipated their form this season.
After winning five of their opening six games, Madrid then went on a barren run, losing five of their next seven matches in all competitions, which in itself included a run of four consecutive games without scoring.
It's clear Real could do with a few additions in January to help kickstart their season, as they look to close the gap on the league leaders and return to playing the style of football the fans have become so used to seeing from Los Blancos.
Here are six players Santiago Solari should consider signing in the upcoming transfer window:
1. Eden Hazard
It's no secret that Real have admired Eden Hazard for quite some time, and it may finally be the time for them to pull the trigger on a move for the Belgian. This transfer story gained huge momentum after the World Cup with the winger claiming he wanted to leave Stamford Bridge in order to pursue his dream move to the Santiago Bernabeu.
Unfortunately for him, the move never materialised and he instead stayed with the Blues where he has made a sublime start to the Premier League season. Scoring 10 goals and bagging nine assists in 19 league appearances so far, Hazard is certainly showing what Madrid are missing out on by posting some stellar statistics.
With a new contract yet to be agreed between himself and Chelsea his future is still up in the air, and Solari may well be tempted to spend big in order to bring the Belgian in to help overturn his side's fortunes.
2. Matthijs de Ligt
Madrid have one of the best centre-back pairing currently in Europe, with the vastly experienced Sergio Ramos accompanied by one of the best young central defenders in world football in the form of Raphael Varane, however beyond them they don't have much cover.
21-year-old Jesus Vallejo is struggling to stay healthy whilst Nacho Fernandez looks to be merely a back up when needed, therefore why not invest in a new central defender? Matthijs de Ligt has emerged as one of the best young talents in recent seasons and has already been named as captain of Ajax at just 19 years of age.
He'll likely cost a fair amount having just won the 2018 Golden Boy award, however when has that ever mattered to Real Madrid? He'd be a long-term replacement for Ramos who's heading into the latter stages of his career, partnered up with another young exciting central defender in Varane.
3. Mesut Ozil
That's right, the return could well be on. Mesut Ozil has been very hit-and-miss with Arsenal fans in recent seasons, given his supposed lack of work rate and failure to produce on the big stages, as they hoped he would when he arrived at the Emirates in 2013.
Arsenal have struggled to offload the German given the fact other clubs are not willing to match his mammoth £350,000-per-week wage he's currently on with the Gunners. However, numerous reports suggest that Madrid could be set to solve the issue with a swap deal including Isco on the cards.
Ozil previously spent three full seasons at the Santiago Bernabeu, winning a La Liga title and a Copa del Rey, and now could well be brought back in order to try and bring the good times back to the Spanish capital.
4. Mauro Icardi
One thing Madrid have really struggled with this season is putting the ball in the back of the net. They've scored half the amount of goals Barcelona has so far this campaign with Karim Benzema struggling to find his scoring boots, and with their main striker struggling to lead the line Madrid have struggled in the final third.
It looks as though they need some attacking reinforcements in January, therefore why not bring in one of Europe's most prolific strikers? Mauro Icardi has had three 20+ goal seasons in the last four years and has made a blistering start to the Serie A campaign this year having scored nine goals in 13 appearances.
Solari could well be tempted to add some more firepower up front with Benzema heading into the back end of his career, and Icardi could be the man to fire Real up the La Liga table.
5. Kylian Mbappe
This one is a bit of a long shot, however it's still a possibility. Kylian Mbappe has emerged as one of the best young players in world football, having been named in the FIFA FIFPro World XI as well as finishing fourth in the Ballon d'Or voting at the age of just 19.
He was a key part in France's run to winning their second World Cup and is now tearing things up in Ligue 1 with Paris Saint-Germain, having scored a remarkable 13 goals in 12 league appearances so far this campaign.
Having moved from Monaco on a permanent deal this summer, it's highly unlikely PSG would allow him to leave so early on in his spell with the Parisians. Although with a cheque book as big as Madrid's it would be hard for PSG not to listen if right offer should be presented.
6. Alex Sandro
Marcelo and Carvajal are viewed as two of the best full backs in Europe, although with the latter struggling to sustain a run of games due to injuries, it wouldn't hurt Madrid to look for some reinforcements.
Madrid have long admired Alex Sandro, with the Brazilian establishing himself as one of the finest in Europe in recent seasons given his pace down the wing and attacking ability, with reports even suggesting they may be tempted to swap him for Marcelo!
The Brazilian recently signed a new contract with Juventus - keeping him at the club until 2023 - although it would be hard for him to turn down a move to the Santiago Bernabeu should the opportunity arise.