Borussia Dortmund currently sit 16th in the Bundesliga, just one point clear of relegation. Just 18 months ago they competed against Bayern Munich in the Champions League final; it's fair to say a lot has changed since then.
It seems that the yellow submarine briefly surfaced atop of the Bundesliga, only to be sent back down to the depths of the ocean by Bayern’s ruthless pursuit of glory.
The sales of Mario Gotze and Robert Lewandowski, combined with their lightweight replacements in the form of Ciro Immobile and Shinji Kagawa, is the main cause of the club's decline. On top of this, an untimely injury to Marco Reus only compounds the struggles that are being felt at the Signal Iduna Park.
Club chairman Hans-Joachim Watzke has struggled to get his head around just what has occurred over the course of the last year and a half, pondering just how much bad luck one side can be forced to take.
Lack of ambition?
Whilst Watzke seems to point to bad luck as the cause of the club's downfall, many fans and pundits view it differently. The clear lack of ambition displayed by selling the best players to their main rival has rendered the squad unenthusiastic about its future prospects.
It appears that many of Dortmund's remaining top talents are seeking to follow Gotze and Lewandowski out of the door and onto pastures green. One player who falls into that category is World Cup winner Mats Hummels.
Hummels to go
Speculation surrounding Hummels's exit from the Signal Iduna Park is nothing new to football fans. However, for the first time, it seems that there may be some truth embedded within these transfer rumours.
As it stands, Arsene Wenger is under more pressure than ever before. He is in dire need of strengthening his side defensively in January. Once again, Le Professeur’s undying faith in his own squad's ability has left him understaffed at the back.
The club's second choice left back, Nacho Monreal, has had to fill in at centre back for an extended period of time, whilst second choice right back Callum Chambers has also had to fill in on occasion.
The need for him
Due to this, the Gunners' need for Hummels is painstakingly obvious. The opportunity for the German to link up with World Cup winning teammates such as Per Mertesacker, Mesut Ozil and Lukas Podolski is surely an attractive prospect. Moreover, the chance to play at a club with a similar football philosophy and similar managerial figurehead to Dortmund would allow for a seamless transition into the Premier League for the 25-year-old.
The only thing that may stand in the way of the deal taking place is a large transfer fee. It is believed that an offer of around £30 million would be required to prise Hummels away from Jurgen Klopp’s side.
Wenger’s infamous reluctance to delve into the club's transfer kitty could put an end to this speculation. However, the immense pressure that the club's fans place him under - combined with the board of directors seemingly running out of patience - could lead to a marquee signing being made in January.