When Arsenal signed Mesut Ozil for £42.5 million in August, it began a chain of events at the club which has seen them rise to the top of the league.
The German international has been pivotal for Arsenal. In the 16 league games he has played, Ozil has provided seven assists and has been involved in countless Arsenal moves that have led to goals.
On Monday night, it was his pass that split open the Aston Villa defence allowing Nacho Monreal to break free and play in Jack Wilshere for the goal.
Ozil has been quiet in some games, but his presence in the squad has had an effect on the Gunners. The mentality has changed showing what one world-class player can do for a team's confidence. It takes a significant amount of time to acclimate to the Premier League, which is the most physically demanding league in the world.
Arsenal's players knew the club needed to sign at least one big name to reinforce a thin squad that has seen the likes of Robin van Persie, Samir Nasri, Cesc Fabregas and others leave in the last few seasons.
The marquee signing of Ozil has certainly been a large part of the Gunners' resurgence. But if they are to continue this surge, they mustn't stop here. Arsene Wenger knows that more world class signings will make the Gunners stronger. So who could emulate Ozil's impact?
Diego Costa—Atletico Madrid
One player setting Europe alight with his goals is Diego Costa. The Brazilian-born Spanish international has helped Atletico Madrid reach new heights, qualifying first in their Champions League group and joining Barcelona at the top of La Liga.
Costa has scored 23 goals in 24 games in all competitions this season, ESPN stats show. With Arsenal lacking in firepower—Olivier Giroud has only scored nine Premier League goals this season—Costa would be a world class addition to the Arsenal strike-force.
However, Arsene Wenger has warned that Costa would actually cost £145 million, reports the Metro, a fee that would put Arsenal off.
If there is one player constantly linked with Arsenal, it is German wunderkind Julian Draxler. As reported by Ed Malyon of the Mirror, the 20-year-old's development has been closely watched, with huge praise from Arsenal's talent spotters:
Having tracked him for years, Arsenal's scouts in Germany have given their boss the ultimate recommendation on Draxler, who has the potential to improve into one of the world's best attacking midfielders.
But a January move seems more and more unlikely, with Wenger likely to focus on loaning a forward.
The German international has been in strong form for his club this season, especially in the Champions League, where his four goals helped shoot the Bundesliga club into the knockout stages.
Former Swindon Town striker-turned-journalist Jan Aage Fjortoft says that Arsenal are favourites for his signature.
Arsene Wenger has identified the 20-year-old as the man to fill the gap. The Daily Star's Tony Stenson reports that Draxler has a £40 million buy-out clause and should Arsenal miss out this transfer window, then they will be back in the summer.
Paul Pogba has had a sensational season for Juventus. The midfielder has been outstanding in a box-to-box role and has even cemented his place in the French national team. During the last transfer window, the Daily Star's Nick Lustig reported Arsenal were interested in the midfielder, but that any official £20 million offer would be rejected by the Old Lady.
ESPN reported via La Repubblica, that the French star said he dreamed of playing for the Gunners.
Pogba, who joined Juventus from Manchester United in July 2012, says he always had the ambition to play for two clubs in particular:
I don't hide that when I was a child I was dreaming to play with Arsenal or Barcelona. I feel good at Juve. And now I dream of playing with the French national team against my brothers.
However, Juventus have ruled out any move for Pogba this window reports the Mirror's Alex Richards. Quoting the Bianconeri's general manager, Giuseppe Marotta, Richards reports that Juventus have declared that the Juventus Stadium is a closed shop where the French starlet is concerned, and that he will be remaining with the Italian champions.