On a manic deadline day that saw Marouane Fellaini follow David Moyes to United, McCarthy follow Martinez to Everton, and Victor Moses follow Daniel Sturridge to Liverpool, the stand out transfer was Mesut Ozil to the Gunners.
The day started with the confirmation of Marko Arnautovic's transfer to Stoke, and Liverpool confirming the signature of Mamadou Sakho from PSG, Victor Moses on loan from Chelsea, and Tiago Ilori from Sporting Lisbon.
This was followed by the news that Arsenal were interested in Real Madrid's Mesut Ozil. This speculation lasted a few hours before it was confirmed that Arsenal had submitted an offer of £42.5million.
Ozil had flown to Germany to meet up with his national team. After Madrid and the Gunners agreed a fee, he proceeded to have a medical in Munich that seemed to last for hours. The medical was carried out by the Bayern Munich and Germany doctor. Ozil was also shooting a commercial with Adidas, which could be the reason for the delay.
Everyone waited for confirmation, and Sky Sports expected the deal to be confirmed by 6:00pm, but the deal went way beyond that. Arsenal fans' patience was rewarded with just 20 minutes of the window remaining and over four hours beyond the expected confirmation time.
Ozil is just 24-years old and plays as an attacking midfielder or winger. He started his senior career with Schalke, where he made 30 appearances in his two-years there.
In 2008, he secured a €4.3million move to Werder Bremen. As at Schalke, he spent two-years at Werder Bremen, but at Bremen he made 71 appearances and scored 13 goals - 13 more than at Schalke.
After an exceptional performance at the 2010 World Cup, he was snapped up by Spanish giants Real Madrid for a reported fee of €15million. Madrid announced that they had reached the agreement after rumours that he had signed for Barcelona. In his three-years at Madrid, he made 105 appearances, scoring 19 goals.
Ozil smashed Arsenal's transfer record when he signed the five-year deal by some £27.5million - he also became the most expensive German footballer.
In an exclusive interview with Sky Deutschland, Ozil said: "I feel confident that our team will reach our goals. We have a very young and capable squad full of players who will grow stronger.
"I feel positive and I say: 'Let's go Gunners'.
"The Premier League is the strongest league in the world and it's a challenge for me as I want to prove myself and prove I'm with the right club - one that supports me and supports the important players in my side.
"I just can't wait and I'm looking forward to it as the fans are very emotional in England - they're crazy about football and I'm looking forward to taking on the league."
In an interview with the German Football Association's official website he said: "At the weekend, I was certain that I would stay at Real Madrid.
"But afterwards I realised that I did not have the faith from the coach or the bosses. I am a player who needs this faith and that is what I have felt from Arsenal, which is why I have joined.
"I am really looking forward to it because I have the faith of the coach. I had spoken to him at length on the telephone, he explained his plans and that he has faith in me - that is what I need as a player."